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Year 1 - Organisation of the Body > innervation and blood supply (for transfer) > Flashcards

innervation and blood supply (for transfer) Flashcards

1
Q

What is the ductus arteriosus?

A
  • Blood vessel in developing foetus that connects the aorta to the left ventricle.
  • Allows the blood to bypass the developing lungs which are still full of fluid.
  • Closure occurs after birth, resulting in the formation of the ligamentum arteriosum.
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2
Q

What supplies blood to the heart?

A

Coronary arteries

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3
Q

What are the different coronary arteries?

A
  • Right coronary artery and left coronary artery form a ring around the atrioventricular groove, forming an incomplete arterial ring. Branches from this reach down to the apex.
  • Left coronary artery
    • Left anterior descending artery -> lies between the ventricles on the anterior side.
    • Left circumflex artery and left marginal artery -> supply the left side of the heart.
    • Posterior descending artery -> variable anatomy, usually supplied by the right coronary artery.
  • Right coronary artery
    • Right marginal artery -> supplies the right side of the heart.
    • Posterior descending artery -> variable anatomy, but this is the more common variation.
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4
Q

What is the venous drainage for the heart?

A

Coronary sinus (drains back into the right atrium).

Some venae cordis minimae (smallest cardiac veins) drain directly into the right atrium rather than entering the chamber through the coronary sinus.

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5
Q

What is the arterial blood supply of the head?

A
  • Each common carotid artery splits (at the coronary sinus) into:
    • Internal carotid artery -> supplies brain, eyes and forehead through the carotid canal of the skull.
    • External carotid artery -> supplies areas of head and neck that are exterior to the cranium.
      • Gives off 6 branches: superior thyroid, linguinal, facial, ascending pharyngeal, occipital and posterior auricular arteries.
    • Each subclavian artery gives off a vertebral artery that converge and supply the brain.
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6
Q

What is the venous supply of the head?

A
  • Internal jugular veins -> drain the brain and parts of the face, drain INTO the subclavian veins to form the brachiocephalic veins.
  • External jugular veins -> drain the superficial tissues of the skull and the posterior and deep parts of the face, draining into the subclavian veins before they join with the internal jugulars.
  • Anterior jugular veins -> drain the neck, draining into the external jugular veins just before they drain into the subclavian.
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7
Q

Describe the arterial supply to the upper limb.

A
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8
Q

Describe the arterial supply to the lower limb.

A
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9
Q

What vessel supplies oxygenated blood to the dorsal surface of the foot?

A

Dorsalis pedis

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10
Q

Describe the venous drainage of the lower limb.

A

Superficial veins:

  • Great saphenous vein
    • Drains blood from the dorsal arch of the foot, running along the medial side of the leg.
    • Passes anterior to the medial malleolus but posterior to the medial condyle at the knee.
    • Drains into the femoral vein just inferior to the inguinal ligament.
  • Small saphenous vein
    • Drains blood from the dorsal arch of the foot and from the dorsal vein of the little toe.
    • Runs along the posterior side of the leg, passing posterior to the lateral malleolus and along the calcaneal tendon, passing between the two heads of gastrocnemius.
    • Empties into the popliteal vein at the popliteal fossa.

Deep veins - RUN ALONG ARTERIES

  • Posterior tibial and fibial vein -> these arise from the lateral and medial plantar veins.
  • Popliteal vein
  • Anterior tibial vein
  • Femoral vein
  • Profunda femoris
  • External iliac vein

Communicating veins drain via the superficial into the deep veins.

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11
Q

What vessels supply oxygenated blood to the walls of large veins and arteries?

A

Vasa vasorum (‘vessels of vessels’)

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12
Q

What is the organisation of the major vessels in the thorax?

A

Thoracic aorta:

  • Ascending aorta gives off the right and left coronary arteries which go to the heart.
  • Aortic arch gives off:
    • The brachiocephalic artery, which in turn gives rise to the right subclavian (supplies the upper limb, neck and thorax) and right common carotid arteries.
    • Left common carotid artery
    • Left subclavian artery
      • Subclavian arteries each give off a thoracic artery that gives off anterior inctercostal arteries. They also give off the vertebral arteries, the major arteries of the neck.
  • Descending aorta gives off:
    • Bronchial arteries
    • Oesophageal arteries
    • Posterior intercostal arteries (go to body wall, where they anastamose with the anterior intercostal arteries).
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13
Q

What is the organisation of the major vessels in the abdomen?

A

Abdominal aorta gives rise to: (in descending order)

  • Inferior phrenic arteries (paired, may arise directly above the coeliac artery or even from it), supply the diaphragm.
  • Coeliac artery (midline, unpaired), arises at ~T12 and supplies the foregut (oesophagus to mid-duodenum)
  • Adrenal/suprarenal arteries (paired), supply the adrenal glands.
  • Superior mesenteric artery (midline, unpaired), arises at ~L1 and supplies the midgut (mid-duodenum to the colon splenic flexure).
  • Renal arteries (paired), arise at ~L1, supply the kidneys.
  • Paired lumbar arteries (series), supplying the posterior abdominal wall.
  • Gonadal arteries (paired), arise at ~L2, supply the gonads.
  • Inferior mesenteric artery (midline, unpaired), arises at ~L3, supplies the hindgut (splenic flexure to the recto-anal junction).

At the level of L4, the aorta bifurcates into the common iliac arteries, which then give rise to:

  • External iliac arteries (supply lower limbs via the femoral artery).
  • Internal iliac arteries (supply the pelvic organs and gluteal region).
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14
Q

What major vessel supplies the head?

A

Common carotid, which bifurcates into the external and internal carotid arteries. (On the RHS, this originates from the brachiocephalic artery).

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15
Q

What major vessel supplies the upper limb and part of the thorax and neck?

A

The subclavian artery. (On the RHS, this originates from the brachiocephalic artery).

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16
Q

What major vessel supplies the foregut?

A

Coeliac artery (T12)

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17
Q

What major vessel supplies the midgut?

A

Superior mesenteric artery (L1)

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18
Q

What major vessel supplies the hindgut?

A

Inferior mesenteric artery (L3)

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19
Q

Which artery supplies the gonads?

A

Gonadal arteries (paired, L2)

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20
Q

Which artery supplies the kidneys?

A

Renal arteries (L1)

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21
Q

What major vessel supplies the lower limb and pelvis?

A

Common iliac arteries (bifurcates to form the internal and external iliac arteries which supply the pelvic organs and lower limb (via the femoral artery) respectively).

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22
Q

What artery supplies most of the thigh with oxygenated blood?

A

Deep femoral artery (profunda femoris)

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23
Q

Describe the aortic supply of the thoracic cage.

A
  • Each subclavian artery gives off internal thoracic arteries that run down the anterior side of the thorax.
  • The internal thoracic arteries give off the anterior intercostal arteries.
  • The descending aorta gives off the posterior intercostal arteries.
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24
Q

What arteries supply the lungs?

A
  • Pulmonary arteries -> Supply exchange parts of the lungs
  • Bronchial arteries -> Supply non-exchange parts of the lungs (e.g. bronchi)
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25
Q

What arteries supply the nasal mucosa?

A

Originating from the internal and external carotid supply:

  • Maxillary artery
  • Facial artery
  • Branches of the ophthalmic artery
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26
Q

Describe the nerves that innervate the nasal passage.

A
  • Olfactory Nerve (I) -> Smell
  • Trigeminal Nerve (V) -> General sensory
  • Facial Nerve (VII) -> Parasympathetic supply (of mucosa)
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27
Q

What nerve innervates the trachea?

A

Pulmonary plexus:

  • Recurrent laryngeal nerves (branches of the vagus) -> Parasympathetic supply
  • Sympathetic trunks -> Sympathetic supply
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28
Q

What nerves innervate the larynx?

A

Branches of the vagus nerve:

  • Recurrent laryngeal nerve -> Sensory innervation of the infraglottis, and motor innervation to all the internal muscles of larynx (except the cricothyroid).
  • Superior laryngeal nerve -> Internal branch provides sensory innervation to the supraglottis, and external branch provides motor innervation to the cricothyroid muscle.
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29
Q

What are the pharyngeal constrictor muscles innervated by?

A

Pharyngeal plexus.

Sensory: Mainly the glossopharyngeal nerve, but the anterior and superior aspect of the nasopharynx is innervated by the maxillary nerve, and the inferior region of the laryngopharynx is innervated by a branch of the vagus nerve.

Motor: All muscles of the larynx are innervated by the vagus nerve, except for the stylopharyngeus muscle which is instead innervated by the glossopharyngeal nerve.

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30
Q

Describe the motor and sensory innervation of the tongue.

A

Motor:

  • Hypoglossal nerve (XII) -> All muscles (except palatoglossus, which is innverated by the vagus (X) nerve)

Sensory:

  • Trigeminal nerve (V) -> General sensation of anterior 2/3rds of tongue
  • Facial nerve (VII) -> Taste sensation of anterior 2/3rds of tongue
  • Glossopharyngeal nerve (IX) -> Both general and taste sensation of posterior 1/3rd
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31
Q

What are the muscles of mastication innervated by?

A

Mandibular branch of the trigeminal nerve (V)

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32
Q

What nerve innervates the upper and lower jaw?

A

Trigeminal nerve (V)

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33
Q

What nerve are the lips innervated by?

A

Trigeminal nerve (V)

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34
Q

Describe the nerves that innervate the nasal passage.

A
  • Olfactory Nerve (I) -> Smell
  • Trigeminal Nerve (V) -> General sensory
  • Facial Nerve (VII) -> Parasympathetic supply (of mucosa)
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35
Q

What nerve roots innervate the diaphragm?

A

C3, C4, C5 keep the diaphragm alive.

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36
Q

What nerves innervate the diaphragm?

A
  • Motor and sensory -> Phrenic nerve
  • Sensory -> Intercostal nerves
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37
Q

Briefly describe the innervation of the heart.

A
  • A cardiac plexus which receives nerves from both the sympathetic and parasympathetic (vagus) systems is located beneath the arch of the aorta
  • Sympathetic fibres innervate both the SAN and AVN, and also the cardiac muscle. Sympathetic activation causes an increase in heart rate and force of contraction.
  • (Parasympathetic) Vagal fibres end primarily on the SAN and cause slowing of the heart.
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38
Q

What nerves innervate arterioles?

A

Sympathetic nerves

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39
Q

Briefly describe the innervation of the circulatory system.

A
  • Arteries -> Post-ganglionic sympathetic fibres control arterial flow and pressure, especially through the diameter of arterioles and alpha receptors
  • Veins -> Constriction increases venous return to the heart (and therefore pre-load). The large veins are also innervated by postganglionic sympathetic nerves, which control their capacity.
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40
Q

Describe the organisation of major veins in the thorax and abdomen.

A

Superior vena cava: Confluence of right and left brachiocephalic veins, which are confluences of:

  • Internal jugular veins (drain head) and subclavian veins (drain external jugular veins and upper limb)
  • Drain the azygos vein just before the SVC enters the right atrium
  • Intercostal veins drain into the azygos vein on the right and the hemi-azygos veins on the left side of the thorax. The hemi-azygous veins drain into the azygous vein.
  • Coronary sinus drains heart

Inferior vena cava:

  • Drains the hepatic portal vein, which drains liver and alimentary tract (indirectly, via the hepatic portal veins)
  • Drains the adrenals, kidneys, gonads, pelvic organs (corresponding veins to arteries)
  • Drains the common iliac veins
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41
Q

Describe the structure of the vena cava and what it drains.

A
  • Superior vena cava drains the head and upper limbs
    • Drains the right brachiocephalic and left brachiocephalic veins, which each drain their corresponding internal jugular and subclavian veins
  • Inferior vena cava drains the abdomen, pelvis and lower limbs
    • Drains multiple tributaries, including the common iliac veins
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42
Q

Describe the structure of the common iliac arteries and veinsand what is flows to/from.

A
  • Bifurcation of the aorta and inferior vena cava, respectively
  • External arteries/veins go to lower limb
  • Internal arteries/veins go to pelvis, buttock and perineum
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43
Q

What is the thoracic duct and what does it drain into?

A
  • The largest lymph duct in the body, originating from about the T12 level.
  • Drains into the left subclavian vein.
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44
Q

Describe the organisation of the lymphatic system.

A
  • Lymph returns to blood vascular system at the junction of the subclavian and jugular veins (differences on R and L sides)
  • Lymphatics that drain directly into the venous confluence:
    • Head (jugular lymph trunks)
    • Upper limb (subclavian lymph trunks)
    • Bronchi & mediastinum (broncho-mediastinal lymph trunks) join venous confluence.
  • Lymphatics that drain into the cisterna chyli, which is emptied into the confluence of the left internal jugular and subclavian veins by the thoracic duct:
    • Lower limb & pelvis (external and internal iliac lymph trunks)
    • Posterior abdominal wall (via para-aortic nodes to cisterna chyli)
    • G-I tract (via midline pre-aortic nodes to cistern)
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45
Q

Which are the deep and which are the superficial veins in the upper limb?

A

Deep:

  • Brachial
  • Ulnar
  • Radial

Superficial:

  • Basilic
  • Cephalic
  • Median cubital
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46
Q

Describe the venous drainage of the thoracic cage.

A
  • Posterior intercostal veins drain into the azygos, hemiazygos and accessory hemiazygos veins
  • The hemiazygos and accessory hemiazygos veins drain into the azygos veins
  • The azygos vein drains into the superior vena cava
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47
Q

Describe the venous drainage of the lungs and bronchi.

A
  • Pulmonary veins drain the lungs -> Drain into the left atrium of the heart.
  • Bronchial veins drain the larger bronchi and structures at the roots of the lungs -> The right side drains into the azygos vein, while the left side drains into the left superior intercostal vein or the accessory hemiazygos vein.
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48
Q

Describe the lymphatic drainage of the lungs and bronchi.

A
  • Lymphatic drainage from lungs follows the tracheobronchial tree
  • Majority of lymphatic drainage is to right lymphatic duct / subclavian vein except left upper lobe
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49
Q

Describe the blood supply and innervation of the foregut.

A
  • Blood: Coeliac artery
  • Innervation: T5-T9
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50
Q

Describe the blood supply and innervation of the midgut.

A
  • Blood: Superior mesenteric artery
  • Innervation: T10-T11
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51
Q

Describe the blood supply and innervation of the hindgut.

A
  • Blood: Inferior mesenteric artery
  • Innervation: T12-L1
52
Q

Describe the blood supply to the duodenum.

A
53
Q

Describe the blood supply to the liver and gall bladder.

A
54
Q

Describe the blood supply to the pancreas.

A

It forms at the junction between the foregut and midgut, so it is supplied by both the coeliac and superior mesenteric arteries:

  • Splenic artery (from coeliac artery)
  • Anterior superior pancreaticoduodenal artery (from coeliac artery)
  • Anterior inferior pancreaticoduodenal artery (from superior mesenteric artery)
55
Q

Describe the blood supply to the rectum.

A

Superior part of the rectum:

  • Superior rectal artery, which is a branch of the inferior mesenteric artery

Middle part of the rectum:

  • Middle rectal artery, which is a branch of the internal iliac artery

Inferior part of the rectum

  • Inferior rectal artery, which is a branch of the pudendal artery, which is a branch of the internal iliac artery
56
Q

Describe the innervation of the anterior and anterolateral abdominal walls.

A

Ilioinguinal and iliohypogastric nerves innervate the lower parts of the abdomen.

57
Q

What nerve provides parasympathetic innervation to the oesophagus?

A

Vagus

58
Q

What nerve root innervates the appendix?

A

T10

59
Q

Compare the muscles and innervation of the two anal sphincters.

A

Internal anal sphincter:

  • Smooth muscle
  • Autonomic control

External anal sphincter:

  • Striated muscle
  • Pudendal nerve (s2-S4) control
60
Q

What stimulates pepsinogen release from Chief (zymogenic) cells?

A

Vagus nerve stimulation

61
Q

What are the two nerve plexuses in the gut?

A
  • Meissner’s/submucosal plexus -> lies in the submucosal layer, mediates:
    • Secretory function
    • Mucosal movement
    • Localised blood flow
  • Auerbach’s/myenteric plexus -> lies in the muscularis layer, mediates:
    • Outer muscularis muscle layer -> Responsible for peristaltic activity
62
Q

Are Meissner’s and Auerbach’s plexuses sympathetic or parasympathetic?

A
  • Meissner’s -> Parasympathetic
  • Auerbach’s -> Sympathetic and parasympathetic
63
Q

What artery supplies the appendix of the large intestine?

A

Appendicular artery (originating from the superior mesenteric artery)

64
Q

Describe what the coeliac artery supplies (and via what arteries it does this).

A

It has 3 main branches:

  • Left gastric artery
    • Lower part of oesophagus
    • Stomach (anterior + posterior)
  • Splenic artery
    • Spleen
    • Pancreas
    • Stomach
  • Common hepatic artery
    • Stomach
    • Duodenum
    • Liver
65
Q

Describe the drainage of the GI tract.

A
  • All of the blood ultimately drains into the liver via the hepatic portal vein
  • The hepatic portal vein is formed by the confluence of the splenic vein and the superior mesenteric vein
  • The inferior mesenteric vein drains into the splenic vein before the confluence
  • The organs drained by each are similar to those supplied by the corresponding arteries
66
Q

What are the branches of the superior mesenteric artery?

A
67
Q

What are the branches of the inferior mesenteric artery?

A
68
Q

Describe the blood supply to the kidneys.

A
  • The renal arteries branch as they enter the kidney into anterior and posterior branches.
  • These then branch into interlobar arteries, which are “end arteries” that supply a segment of the kidneys.
  • Each interlobar artery gives rise to arcuate arteries, which in turn form interlobular arteries (and give off the vasa recta), which supply the nephrons.

Note the difference between interlobar and interlobular!

69
Q

Describe the blood supply to the bladder.

A

From the internal iliac supply via the vesicular arteries.

70
Q

Which major artery supplies the pelvis?

A

Interior iliac artery

71
Q

Describe how the internal iliac artery supplies different pelvic structures in males.

A

Internal iliac artery divides into an anterior and posterior divisions

It is only the anterior that we are interested in for now

It gives off:

  • Umbilical artery -> To bladder (via superior vesical artery)
  • Obturator artery -> To medial compartment of thigh
  • Inferior vesical artery -> To bladder, prostate and seminal vesicles
  • Internal pudendal artery -> To perineal structures (e.g. to external genitalia)
  • Middle rectal artery -> To rectum
  • Inferior gluteal artery -> To gluteal region
72
Q

Describe how the internal iliac artery supplies different pelvic structures in females.

A

Internal iliac artery divides into an anterior and posterior divisions

It is only the anterior that we are interested in for now

It gives off:

  • Umbilical artery -> To bladder (via superior vesical artery)
  • Obturator artery -> To medial compartment of thigh
  • Uterine artery -> To uterus
  • Vaginal artery (sometimes comes off uterine artery) -> To vagina
  • Internal pudendal artery -> To perineal structures (e.g. to external genitalia)
  • Middle rectal artery -> To rectum
  • Inferior gluteal artery -> To gluteal region

Note: Some of the arteries are quoted as coming off the posterior rather than anterior division, but this is disputable so I have listed everything as coming off the anterior branch.

73
Q

What is the glomerulus supplied and drained by?

A
  • Supplied by afferent arteriole
  • Drained by efferent arteriole
74
Q

What nerves innervate the pelvic floor?

A

S3 and S4 (keep your shit off the floor)

75
Q

Describe the location and difference between the internal and external sphincters of the bladder. [IMPORTANT]

A

Internal

  • Involuntary
    • Innervated by autonomic nerves
    • Found superior to the prostate, just near the exit of the bladder

External

  • Voluntary
    • Innervated by somatic nerves
    • Found inferior to the prostate, just next to the levator ani muscles
76
Q

What are the autonomic nerves that innervate the bladder sphincters?

A
  • Sympathetic: Presacral nerves (L1 and L2)
  • Parasympathetic: Pelvic parasympathetic nerves (S2, S3 and S4)

These innervate the internal sphincter.

77
Q

What are the somatic nerves that innervate the bladder sphincters?

A

Pudendal nerve innervates the external sphincter.

78
Q

Describe the blood supply and drainage of the testis and epididymis. [IMPORTANT]

A

Blood supply:

  • Each testis and epididmyis is supplied by a testicular artery, which is a branch of the aorta

Blood drainage:

  • Each testis is drained by vesicular veins are arranged in a pampiniform venous plexus
  • These pass through the inguinal canal that unite to form a single vein
  • Left testicular vein -> Drains into left renal vein
  • Right testicular vein -> Drains directly into IVC
79
Q

Describe the blood supply of the ductus (vas) deferens, bladder and prostate.

A

Arterial supply (all derived from internal iliac artery):

  • Ductus deferens -> Umbilical artery
  • Bladder and prostate -> Superior and inferior vesicular arteries

Venous drainage:

  • Prostate -> Drains back to vertebral venous plexus
80
Q

Describe the arterial blood supply and drainage of the penis.

A

Pudendal artery branches into:

  • Dorsal artery -> Supplies dorsal surface of penis
  • Deep artery -> Supplies corpus cavernosum

Superficial and deep dorsal veins drain the penis.

81
Q

What are the 3 main arteries supplying the female reproductive system? What do these branch from?

A
  • Uterine artery -> From abdominal aorta
  • Ovarian artery -> From internal iliac artery
  • Vaginal artery -> From internal iliac artery or ovarian artery
82
Q

Describe the blood supply and drainage of the ovaries. [IMPORTANT]

A

Supply:

  • Ovarian artery -> From the abdominal aorta

Drainage:

  • Drains to the IVC
83
Q

Describe the blood supply and drainage of the uterus. [IMPORTANT]

A

Supply:

  • Uterine artery from the internal iliac artery

Drainage:

  • Internal iliac vein
84
Q

Describe the blood supply to the vagina.

A

Vaginal artery, which is a branch of the internal iliac artery or uterine artery.

85
Q

Draw a diagram showing the blood supply to the female reproductive system.

A
86
Q

What does the internal pudendal artery supply and what is its path?

A
  • It supplies the perineum and external genitalia
  • It is a branch of the internal iliac artery
  • Exits the pelvis via the greater sciatic foramen and enters the perineum via the lesser sciatic foramen, passing through the pudendal canal
87
Q

Describe the blood supply to the penis and scrotum.

A

The supply to the penis comes from the internal pudendal artery (a branch of the internal iliac artery):

  • Artery of bulb -> Supplies the bulb of the penis
  • Deep artery of penis -> Supplies corpus cavernosum
  • Dorsal artery of penis -> Supplies distal corpus spongiosum and facial skin of penis
  • (The internal pudendal artery also gives rise to the posterior scrotal artery that supplies some of the scrotum)

The supply to the scrotum comes from the external pudendal artery (a branch of the femoral artery):

  • Anterior scrotal artery -> Supplies most of the scrotum
88
Q

Describe the blood supply and drainage of the ovaries.

A

Each ovary receives an ovarian artery from the aorta and drains into a pampiniform plexus of veins.

89
Q

Describe the blood supply to an ovarian follicle.

A

The blood supply to the developing follicle is restricted to the thecal layer.

90
Q

What arteries supply the endometrium?

A

Spiral arteries

91
Q

Describe the lymphatic drainage of the testis.

A

Lymphatic vessels run alongside the arteries and drain into para-aortic lymph nodes.

92
Q

What is the innervation of the cremaster muscle?

A

Innervated by the genital branch of the genitofemoral nerve (L1/L2).

93
Q

What type of nerve fibres is the dartos muscle innervated by?

A

Sympathetic

94
Q

Describe the innervation of the muscles that assist the functioning of the penis (bulbospongiosus and ischiocavernosus).

A

Pudendal nerve (S2-S4)

95
Q

Which nervous system is responsible for erection?

A

Parasympathetic

96
Q

Which nervous system is responsible for emission of semen (not ejaculation!)?

A

Sympathetic

97
Q

Which nervous system is responsible for ejaculation of semen?

A

Somatic

98
Q

Describe how erection occurs.

A

Normally, the helicine arteries of the corpora are contracted, so that little blood flows into the penis

Parasympathetic contribution to erection:

  • When achieving erection, the helicine arteries of corpora relax
  • Cavernous nerves (S2-S4)

Somatic contribution to erection:

  • Contraction of bulbospongiosus and ischiocavernosus impedes venous return
  • Pudendal nerve
99
Q

What are the seminal vesicles innervated by?

A

Sympathetic nerves

100
Q

What is the prostate gland innervated by?

A

Sympathetic nerves

101
Q

Which nerve and muscles control ejaculation?

A
  • Bulbospongiosus muscle and anal sphincter
  • Controlled by the pudendal nerve (somatic)
102
Q

Describe and explain the innervation of the female reproductive tract.

A

The pelvic pain line divides the female reproductive tract, passing just above the cervix

Above this line:

  • All the structures (uterus, Fallopian tubes and ovaries) are covered by parietal peritoneum (they are intraperitoneal)
  • Innervated by sympathetic and visceral afferent nerves (T12-L2)

Below this line:

  • All of the structures (cervix and vagina) are subperitoneal (not covered by the parietal peritoneum)
  • Pelvic splanchnics S2-S4 (parasympathetic) provide most of the innervation
  • Pudendal nerves S2-S4 (parasympathetic) provide the innervation to the distal vagina and perineum
103
Q

What is a good way to remember pelvic innervation?

A
  • If something is innervated by parasympathetic fibres, it is very likely to be innervated by the S2-S4 level, especially the pudendal nerve
  • If something is innervated by sympathetic fibres, it is likely to be from the thoracic and lumbar regions, since this is where sympathetic fibres come from
104
Q

What nerves innervate above the pelvic pain line?

A

Sympathetic + Visceral afferents (T12-L2)

105
Q

What nerves innervate below the pelvic pain line?

A
  • Pelvic splanchnics S2-S4 (parasympathetic) provide most of the innervation
  • Pudendal nerves S2-S4 (parasympathetic) provide the innervation to the distal vagina and perineum
106
Q

What are two important erectile muscles in females? Where are they found? What is the innervation of these?

A
  • Bulbospongiosus
  • Ischiocavernosus

They are found in the superficial perineal pouch, just inferior to the perineal membrane. They are innervated by S2-S4 pudendal nerve.

107
Q

Describe the vasculature of the hypothalamus and pituitary.

A
  • Posterior pituitary receives blood supply direct from internal carotid artery
  • Hypothalamus receives branches direct from internal carotid artery -> These form a capillary plexus in the base of the hypothalamus that forms portal veins which supply the anterior pituitary.
  • Anterior pituitary receives blood from hypothalamo-hypophysial portal veins.
108
Q

Describe the blood supply to the thyroid.

A
  • Superior thyroid artery -> First branch of the external carotid artery.
  • Inferior thyroid artery -> Arises from the thyrocervical trunk (which in turn is a branch of the subclavian artery).
109
Q

Describe the blood supply and drainage of the adrenal glands. [IMPORTANT]

A

Arterial supply:

  • Branches of the inferior phrenic artery, the renal arteries and the aorta.
  • These small arteries form an arterial plexus beneath the capsule surrounding the adrenal and then enter a sinusoidal system that penetrates the cortex and the medulla draining into a single central adrenal vein in each gland.

Venous drainage:

  • The veins drain to the inferior vena cava (R) and renal vein (L).
110
Q

What innervation stimulates insulin secretion? What inhibits it?

A

Stim: Parasympathetic

Inhib: Sympathetic

111
Q

What innervation stimulates glucagon secretion?

A

Sympathetic innervation

112
Q

Describe the innervation of the adrenal glands.

A
  • Principally to the medulla.
  • Innervated by thoracic preganglionic sympathetic nerves which release ACh, acts at nicotinic receptors -> NOTE that this is unusual because there are no post-ganglionic nerves.
113
Q

What are the 3 main pairs of arteries draining the early embryo? What do they drain into?

A
  • Vitelline veins
  • Cardinal veins
  • Umbilical veins

They all drain into the sinus venosus of the early heart.

114
Q

What do the vitelline veins drain in the early embryo?

A

Yolk sac

115
Q

What do the cardinal veins drain in the early embryo?

A

Body

116
Q

What do the umbilical veins drain in the early embryo?

A

Placenta

117
Q

Which spinal nerve roots grow into the upper and lower limbs?

A
  • Upper limb = C5-T1/2
  • Lower limb = L2-S2
118
Q

Describe the blood supply to the different pharyngeal arches.

A

Each pharyngeal arch is supplied by a different aortic arch.

119
Q

For the 1st pharyngeal arch, state the derived:

  • Nerves
  • Muscles
  • Skeletal elements
A
  • Nerves -> Trigeminal nerve
  • Muscles -> Muscles of mastication
  • Skeletal elements -> Maxilla and mandible, Malleus and incus
120
Q

For the 2nd pharyngeal arch, state the derived:

  • Nerves
  • Muscles
  • Skeletal elements
A
  • Nerves -> Facial
  • Muscles -> Muscles of facial expression
  • Skeletal elements -> Styloid process + Stapes
121
Q

For the 3rd pharyngeal arch, state the derived:

  • Nerves
  • Muscles
  • Skeletal element
A
  • Nerves -> Glossopharyngeal nerve
  • Muscles -> Stylopharyngeal muscle
  • Skeletal element -> Hyoid bone
122
Q

For the 4th (and some of 6th) pharyngeal arch, state the derived:

  • Nerves
  • Muscles
  • Skeletal elements
A
  • Nerves -> Vagus (6th also said to include accessory nerve)
  • Muscles -> Pharyngeal and laryngeal muscles
  • Skeletal elements -> Laryngeal cartilages
123
Q

What is the nerve of the 1st pharyngeal arch and what does it innervate?

A

Trigeminal nerve:

  • Motor -> Muscle of mastication
  • Sensory -> Skin of face, Oral and nasal mucosa, Anterior 2/3rd of tongue
124
Q

What is the nerve of the 2nd pharyngeal arch and what does it innervate?

A

Facial nerve:

  • Motor -> Muscles of facial expression
  • Sensory -> Anterior 2/3rd of tongue (taste)
125
Q

What are the nerves of the 3rd, 4th and 6th pharyngeal arch and what do they innervate?

A

Year 1 - Organisation of the Body (20 decks)

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