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GM PNS > Exam 2 CN X > Flashcards

Exam 2 CN X Flashcards

1
Q

Is vagus a motor or sensory nerve?

A

It is mixed!

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2
Q

What type of fibers does the vagus nerve carry

A

Motor, parasympathetic, and sensory information

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3
Q

Where does the vagus carry some taste information from

A

The epiglottal region

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4
Q

What 2 things make the vagus nerve so special

A
  • it is the longest cranial nerve

- it is the most important parasympathetic nerve

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5
Q

Where are the motor fibers cell bodies that are carried in the vagus

A

In the nucleus ambiguus

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6
Q

Where does the nucleus ambiguus receive information from

A

Both cerebral hemispheres

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7
Q

Where do preganglionic parasympathetic fibers arise from in the vagus

A

The posterior (dorsal) nucleus of the vagus

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8
Q

Where do the preganglionic parasympathetic fibers receive info from?

A

Indirectly from hypothalamus and carotid sinus

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9
Q

What terminates in the spinal nucleus of CN V when talking about the vagus

A

Somatic sensory

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10
Q

What information terminates in the nucleus of the solitary tract

A

Taste and viscerosensory

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11
Q

What two peripheral ganglia are associated with the vagus nerve and what are their alternate names?

A

Superior (jugular) and inferior (nodose) ganglions . Not the same as in CN IX

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12
Q

Where are the cell bodies located for neurons carrying somatic sensory information

A

Superior ganglion or jugular ganglion

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13
Q

How is taste from the epiglottis carried in vagus

A

Carried to the superior portion of nucleus of the solitary tract by neurons located in the inferior ganglion

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14
Q

How is visceral sensory information carried in the vagus

A

It is carried to the inferior part of the nucleus for the solitary tract by neurons located in the inferior ganglion

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15
Q

Where does the vagus nerve carry visceral sensory information from?

A

Larynx, laryngopharynx, viscera in thoracic/abdominal cavities, pressure receptors in aortic arch, chemoreceptors in para-aortic body

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16
Q

Where does the vagus nerve emerge from as a series of rootlets

A

The lateral aspect of medulla oblongata (A.O.)

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17
Q

What branch of vagus supplies the infratentorial dura (posterior cranial fossa)?

A

Meningeal branch

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18
Q

How does the vagus exit the skull?

A

Through the jugular foramen

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19
Q

How is the jugular foramen compartmentalized

A

By a fibrous septum. C.N. X and XI travel anterior to the septum. C.N. IX travels posterior to the septum

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20
Q

What two CN share a meningeal sheath (arachnoid and dura)

A

CN X and XI

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21
Q

Which ganglion is located in the jugular foramen

A

The superior ganglion

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22
Q

Where is the inferior ganglion located

A

Just inferior to jugular foramen

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23
Q

What branch carries sensory information from the meatus and small portion of the auricle

A

The auricular branch

24
Q

What is the course of the auricular branch

A

Through mastoid canaliculus and tympanomastoid fissure to reach external auditory meatus

25
Q

After exiting the jugular foramen and moving inferiorly what does the vagus nerve travel within

A

Carotid sheath

26
Q

Where is the carotid sheath located

A

Between internal carotid artery and internal jugular vein

27
Q

Where does the vagus nerve travel after the carotid sheath

A

Between the internal jugular vein and common carotid artery inferior to carotid bifurcation

28
Q

Where does the pharyngeal branch leave the vagus nerve

A

At the level of the inferior ganglion

29
Q

What fibers does the pharyngeal branch combine with after leaving inferior ganglion

A

Combine with fibers from glossopharyngeal nerve and sympathetic fibers from sympathetic trunk

30
Q

What does the pharyngeal branch of vagus make when it joins fibers from the glossopharyngeal nerve and sympathetic fibers

A

The pharyngeal plexus

31
Q

After the pharyngeal branch combines with other fibers in the neck what will vagal fibers provide motor supply to

A

Pharyngeal constrictor muscles, and levator veli palatine muscles of soft palate

32
Q

Branches to carotid artery are also given off where

A

In the inferior ganglion

33
Q

What do branches to the carotid artery carry

A

Viscerosensory fibers that relay info from chemoreceptors in carotid body to inferior part of nucleus for solitary tract

34
Q

Where is the superior laryngeal nerve given off

A

Just inferior to inferior ganglion

35
Q

What does the superior laryngeal nerve split into and what do they do

A
  • external laryngeal provides motor supply to cricothyroid muscle
  • internal laryngeal nerve carries sensory info from laryngeal mucosa as far inferior as vocal folds
36
Q

Where does the recurrent laryngeal nerve supply motor fibers to

A

All muscles of larynx except the cricothyroid

37
Q

Where does the recurrent laryngeal nerve carry sensory info from

A

The larynx inferior to vocal folds

38
Q

What is unique about the path of the left recurrent laryngeal nerve

A

Comes off vagus and passes under aortic arch becoming the inferior laryngeal nurve

39
Q

What does the inferior laryngeal nerve supply

A

Laryngeal musculature

40
Q

Where does the right recurrent laryngeal nerve pass

A

Posteriorly under the subclavian artery before ascending

41
Q

What do the superior and inferior cardiac branches carry

A

Parasympathetic information to the cardiac plexus

42
Q

Where do the superior branches of the cardiac branch go

A

Leave vagus nerve and travel with great vessels to cardiac plexus

43
Q

Where do branches of inferior cardiac branches go

A

Given off by recurrent laryngeal nerves and travel to cardiac plexus

44
Q

What is unique about the superior and inferior cardiac branches

A

One branch will carry viscerosensory information concerning pressure of the wall of aorta. Nerve is stimulated when aortic pressure becomes too high

45
Q

What is the path of vagus before contributing to pulmonary plexus

A

Enters thorax pass posterior to the root of ipsilateral lung

46
Q

What is path of vagus near the esophagus

A

Right passes posteriorly and left passes anteriorly over esophagus contributing to esophageal plexus

47
Q

Where does right vagus enter abdominal cavity and what does it become

A

Through esophageal opening becoming posterior vagal trunk

48
Q

What does the right vagus do after entering abdominal cavity

A

Becomes posterior vagal trunk sending branches to posterior stomach and terminating in large celiac branch

49
Q

Where does the large celiac branch send branches to

A

Duodenum, liver, kidneys, small intestine, and proximal 2/3 of large intestine

50
Q

What makes up the superior messenteric plexus

A

Small intestine, and proximal 2/3 large intestine

51
Q

What makes up the celiac plexus

A

Duodenum, liver, Small intestine

52
Q

What does the left vagal nerve become after entering abdominal cavity

A

Anterior vagal trunk

53
Q

Where does the anterior vagal trunk send branches to

A

Stomach, liver, pancreas, and superior part of the duodenum

54
Q

What is bilateral transection

A

Both vagus nerves cut, patient would die do to no supply to necessary areas

55
Q

What would lesions within the vault or close to skull produce

A

Widespread problems especially related to palate, pharynx, larynx

56
Q

What would damage to the recurrent laryngeal nerve produce

A

Speech issues like hoarseness or decreased volume of speech

GM PNS (12 decks)

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