Nerves 0.0

Question 1

Ilioinguinal N. (___)

Answer 1

L1;

branches into anterior scrotal N./ anterior labial N

Question 2

Genitofemoral N. ___

Answer 2

L1-2

Supplies scrotum in males and labia majora in females

Question 3

Obturator N.

Answer 3

L2-L4

Innervates the. medial thigh muscle

Question 4

Lumbosacral Trunk

Answer 4

L4-L5

Question 5

What is supplied by the superior gluteal nerve?

Answer 5

L4-S1

Gluteus medius and gluteus minimus.

Question 6

Sacral Plexus ____

Answer 6

L4-S4

1. Superior gluteal N. (L4-S1)
2. Inferior gluteal N. (L5-S2)*
3. Nerve to the quadratus femoris M. (L4-S1)
4. Nerve to the obturator internus M. (L5-S2)*
5. Nerve to the piriformis M. (S1-S2)
6. Perforating Cutaneous Branches (S1-S3) -> butt. and upper posterior thigh
7. 1 Perforating Cutaneous Branches (S2-3) -> to the Medial Buttock
8. Pudendal N. (S2-S4)

• Inferior rectal N- innervates. the. anal canal inferior to the pectinate. line and external sphincter m.
• Dorsal N. of the Penis
• Dorsal N. of the clitoris
• Deep perineal N; supplies
  
  • superior transverse perineal Ms,
  • deep transverse perineal Ms,
  • ischiocavernosus m.,
  • bulbospongiosus m.,
  • vaginal vestibule and
  • most inferior part of the vagina.
• Superficial perineal N
  
  • Posterior scrotal N. (posterior part of scrotum)
  • Posterior Labial N. (posterior aspect of labia majora)

8. Sciatic N (L4-S3) (lower extremity)
9. Pelvic splanchnic N. (L4-S3)

Question 7

1. Superior gluteal N. (___)
2. Inferior gluteal N. (___)
3. Nerve to the quadratus femoris M. (____)

Answer 7

• 1. Superior gluteal N. (L4-S1)
     * Glut med, glut min and TFL
• 2. Inferior gluteal N. (L5-S2)
     * Glut max.
• 3. Nerve to the quadratus femoris M. (L4-S1)
     * ​quad femoris
     * inferior gemellus M

Question 8

3. Nerve to the quadratus femoris M. (____)
4. Nerve to the obturator internus M. (____)
5. Nerve to the piriformis M. (____)

Answer 8

3. Nerve to the quadratus femoris M. (L4-S1)
4. Nerve to the obturator internus M. (L5-S2)

• obturator internus m
• Superior. gemellus m.

5. Nerve to the piriformis M. (S1-S2)

Question 9

6. Posterior femoral Cutaneous N (___)
7. 1 Perforating Cutaneous Branches (___)

Answer 9

6. Posterior femoral Cutaneous N (S1-S3) -> butt. and upper posterior thigh

6.1 Perforating Cutaneous Branches (S2-3) -> to the Medial Buttock

Question 10

7. Pudendal N. (___)

Answer 10

• inferior rectal N.
  
  • anal canal below the pectinate line and external sphincter m.
• Dorsal N of the penis.
  
  • ​penis
  • external urethral sphincter m
• Dorsal N. of the clitoris
  
  • ​clitoris
  • external urethral sphincter m
• Superior perineal N.
  
  • Posterior scrotal N.
  • Posterior labial N.
• Deep perineal N.
  
  • Supply: superior transverse perineal M, deep transverse perineal M, ischiocaverosus m., bulbospongiosus m., vaginal vestibule and inferior most part of vagina.

Question 11

8. Sciatic N (___)
9. Pelvic splanchnic N. (___)

Answer 11

Sciatic N (L4-S3) (lower extremity)

Pelvic splanchnic N. (S2-S4)

Question 12

Coccygeal Plexus (_____)

Answer 12

S4-S5 and coccygeal N.

1. Anococcygeal N- innervates a small area of skin in coccygeal region
2. Nerve to levator ani (S4)
3. Nerve to the coccygeus (S4-S5)

Question 13

The superior hypogastric plexus gives rise to what three other plexuses?

Answer 13

1. Ureteric plexus.
2. Testicular plexus.
3. Common iliac plexus.

Question 14

What are the branches of the sacral plexus?

Answer 14

1. Sciatic nerve.
2. Pudendal nerve.
3. Superior gluteal nerve.
4. Inferior gluteal nerve.

Question 15

From which spinal nerves do the somatic nerves of the lower limb, pelvis, and perineum arise?

Answer 15

1. L4-L5 (lumbar plexus contribution).
2. S1-Co

Question 16

What is the function of the pudendal nerve?

Answer 16

Innervation of the

1. perineum
2. sensory afferents for the external genitalia and
3. anal canal (below the pectinate line)

Question 17

The pudendal nerve enters the perineum via which structure?

Answer 17

The lesser sciatic foramen – contained in the pudendal canal.

Question 18

What provides the sympathetic and parasympathetic contributions to the inferior hypogastric plexus?

Answer 18

Sympathetic:

1. R/L hypogastric nerves (from the superior hypogastric plexus)
2. sacral splanchnic nerves.

Parasympathetic:

1. pelvic splanchnic nerves.

Question 19

Where to the superior rectal, middle rectal, and inferior rectal arteries come from respectively?

Answer 19

• Inferior mesenteric artery -> superior rectal artery.
• Anterior division of the internal iliac artery -> middle rectal artery.
• Internal pudendal artery -> inferior rectal artery.

Question 20

The lumbosacral plexus receives contributions from which anterior rami?

Answer 20

L4-L5 and

S1-S4

Question 21

What is the nerve supply, blood supply, venous supply, and lymphatic drainage above the pectinate line?

Answer 21

1. Nerves: Inferior Hypogastric Plexus.
2. Blood: Inferior Mesenteric A.
3. Veins: Superior Rectal Veins (Portal System).
4. Lymph: Internal Iliac Lymph Nodes

Question 22

What is the nerve supply, blood supply, venous drainage, and lymphatic drainage below the pectinate line?

Answer 22

• Nerves: Inferior Rectal Nerves (somatic).
• Blood: Internal Iliac
• Veins: Inferior Rectal Veins (Systemic).
• Lymph: Superficial Inguinal Lymph Nodes.

Question 23

Which anal sphincter is under voluntary control?

Answer 23

The external anal sphincter.

Question 24

From where does the internal urethral sphincter get its innervation?

From where does the external urethral sphincter get its innervation?

Answer 24

The inferior hypogastric plexus.

The dorsal n. of. the penis of dorsal. n. of the. clitoris.

Question 25

The median umbilical ligament is attached to what part of the bladder?

Answer 25

apex

Question 26

What nervous contribute to the innervation of the ureters?

Answer 26

* The **preaortic plexus**. * **Hypogastric plexus.** * **Pelvic splanchnic nerves.**

Question 27

**Ilioguinal N (L1)** path:

Answer 27

* 1. Comes. off lumbar. plexus. (L1-L4) * 2. goes into the inguinal canal * 3. Goes into the spermatic cord * 4. Goes into scotom or labia majora * Anterior. scrotal N or the anterior labial N

Question 28

**Sacral Sympathetic Trunk**

Answer 28

* A paravertebral sympathetic trunk that is continuous with the lumbar sympathetic trunk; * has 4 paired ganglia and ends inferiorly in the midline at. the ganglion impar, where the L and R paravertebral trunk meet.

Question 29

what is the abdominopelvic Splanchnic N. Originating in the Pelvis

Answer 29

**sacral splanchnic n** **Post-synpatic sympathetic fiber from sacral sympathetic trunk -\> inferior hypogastric plexus**

Question 30

Intermesenteric Plexus (mixed Sympathetic and Parasympathetic, Sympathetic and Parasympathetic input from the Superior Mesenteric Plexus, part of the Aortic Plexus, forms the Periarterial Plexus which follow the gonadal arteries, also feeds Sympathetic into the Inferior Mesenteric Plexus and Superior Hypogastric Plexus) 1. Periarterial Plexus (descends with the Ovarian A.) a. Ovarian Plexus (innervates the Uterine Tubes and Ovaries)

Question 31

How will olinger tag Deep/Superficial Perineal N.

Answer 31

Superficial perineal N: goes into skin or nothing (a cut nerve) Deep perineal N: goees into muscle

Question 32

Lumbar Splanchnic N path

Answer 32

Lumbar Splanchnic N (presynpatic sympathetic fibers from L1-L5) -\> **Inferior mesenteric ganglion,** where it synapse on some post-synaptic fibers, with some post-synaptiv fibers feeding into the s**uperior hypogastric plexus**

Question 33

What is a **rami communicans**

Answer 33

1. **Postsynaptic** **Sympathetic** Fibers that leave Sacral Sympathetic Trunk -\> 2. Anteior Rami of Sacral and Coccygeal Spinal Nerve 3. -\> provide **Sympathetic Innervation to the Lower Extremity**

Question 34

Pelvic Splanchnic N.

Answer 34

**_Presynaptic parasympathetic_ fibers from S2-4** **-run with anterior rami of sacral spinous nerve -\>** **-\> pop out of the sacral spinous nerve-\>** Meet with _sympathetic fibers of hypogastric nerve_ to form the **inferior hypogastric plexus.**

Question 35

why is the ***_inferior mesenteric plexus_*** important?

Answer 35

it is a conduit: send informariot Receives sym/parasym info from the superior mesenteric plexus -\> Sends sympathetic into the **Inferior Mesenteric Plexus** and Superior Hypogastric Plexus)

Question 36

Why is _superior hypogastric plexus_ important? ## Footnote **Sypathetic input from:** **Produces the:** **Sends:**

Answer 36

Not mixed: IT. IS **SYMPATHETIC** **Sypathetic input from:** 1. **_Lumbar Splanchnic Ns._, which go through the intermesenteric ganglion.** **Produces the:** 1. **_Ureteric Plexus_** 2. **_Testicular Plexus_, which travel along the Common Iliac As.,** **Sends paired _Hypogastric Ns_. to the _Inferior_** **_Hypogastric Plexus_**

Question 37

How do we get sympathetic information. into the **inferior hypogastric plexus?**

Answer 37

**Superior mesenteric plexus** send sympathetic **Hypogastric Ns.** ## Footnote **sacral splanchnic** **ramus communicans (rami communicantes)**

Question 38

**Inferior hypogastric plexus _(pelvic plexus to rectum and colon)_** Type: Fibers from:

Answer 38

MIXED SYMPATHETIC AND PARA * **Sympathetic from:** * **​**hypogastric nerves * sacral splanchnic nerves (come off of sacral sympathetic trunk-\> IHP) * ramus communicans (come off sacral sympathetic trunk -\> anterior rami of sacral spinal N) to send symp info everywhere. * **Parasympathetic from:** * pelvic splanchnic nerves (come off of anterior rami of spinal nerves -\> IHP)

Question 39

What. does the inferior hypogastric plexus do in **F**.

Answer 39

forms multiple subplexuses called Pelvic Plexuses. 1. **Vesical Plexus** -\> _detrusor and internal urethral sphincter m._ 1. Sympathetic: causes contraction of the Internal Urethral Sphincter M.; 2. Parasympathetic: contraction of the Detrusor M. and relaxation of the Internal Urethral Sphincter M. 2. **Uterovaginal Plexus**-\> inn. WITH BOTH PARASYMPATHETIC AND SYMPATHETIC, except erectile tissue 1. uterus, 2. vagina, 3. vestibular glands 4. erectile tissue 1. Caveronous Ns-\> erection of clit, engorgement of bulbs and increases vaginal secretion

Question 40

What. does the inferior hypogastric plexus do in M.

Answer 40

forms multiple subplexuses called Pelvic Plexuses. * **Vesical Plexus**-\> detrusor and internal urethral sphincter m. * **Prostatic plexus**-\> inn. WITH BOTH SYMPATHETIC AND PARASYMPATHETIC, except in the erectile tissue (only. parasympathetic * prostate gland, * proximal urethra, * ductus deferens, * N. to the ductus deferens -\> **sympathetic: contract urethral sphincter m.** * **ejaculatory ducts,** * N. to the ejaculatory. ducts-\> **symp:** contraction of the ejaculatory. ducts * seminal vesicles * N. to the seminal vesicles -\>. **symp:** contraction and secretion of seminal vesicles -\> semen * erectile tissue * Cavernous N (ONLY PARASYMPATHETIC)- \> makes erection