Exam 2 CN X

Question 1

Is vagus a motor or sensory nerve?

Answer 1

It is mixed!

Question 2

What type of fibers does the vagus nerve carry

Answer 2

Motor, parasympathetic, and sensory information

Question 3

Where does the vagus carry some taste information from

Answer 3

The epiglottal region

Question 4

What 2 things make the vagus nerve so special

Answer 4

• it is the longest cranial nerve

- it is the most important parasympathetic nerve

Question 5

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

Answer 5

In the nucleus ambiguus

Question 6

Where does the nucleus ambiguus receive information from

Answer 6

Both cerebral hemispheres

Question 7

Where do preganglionic parasympathetic fibers arise from in the vagus

Answer 7

The posterior (dorsal) nucleus of the vagus

Question 8

Where do the preganglionic parasympathetic fibers receive info from?

Answer 8

Indirectly from hypothalamus and carotid sinus

Question 9

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

Answer 9

Somatic sensory

Question 10

What information terminates in the nucleus of the solitary tract

Answer 10

Taste and viscerosensory

Question 11

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

Answer 11

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

Question 12

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

Answer 12

Superior ganglion or jugular ganglion

Question 13

How is taste from the epiglottis carried in vagus

Answer 13

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

Question 14

How is visceral sensory information carried in the vagus

Answer 14

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

Question 15

Where does the vagus nerve carry visceral sensory information from?

Answer 15

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

Question 16

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

Answer 16

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

Question 17

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

Answer 17

Meningeal branch

Question 18

How does the vagus exit the skull?

Answer 18

Through the jugular foramen

Question 19

How is the jugular foramen compartmentalized

Answer 19

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

Question 20

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

Answer 20

CN X and XI

Question 21

Which ganglion is located in the jugular foramen

Answer 21

The superior ganglion

Question 22

Where is the inferior ganglion located

Answer 22

Just inferior to jugular foramen

Question 23

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

Answer 23

The auricular branch

Question 24

What is the course of the auricular branch

Answer 24

Through mastoid canaliculus and tympanomastoid fissure to reach external auditory meatus

Question 25

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

Answer 25

Carotid sheath

Question 26

Where is the carotid sheath located

Answer 26

Between internal carotid artery and internal jugular vein

Question 27

Where does the vagus nerve travel after the carotid sheath

Answer 27

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

Question 28

Where does the pharyngeal branch leave the vagus nerve

Answer 28

At the level of the inferior ganglion

Question 29

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

Answer 29

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

Question 30

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

Answer 30

The pharyngeal plexus

Question 31

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

Answer 31

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

Question 32

Branches to carotid artery are also given off where

Answer 32

In the inferior ganglion

Question 33

What do branches to the carotid artery carry

Answer 33

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

Question 34

Where is the superior laryngeal nerve given off

Answer 34

Just inferior to inferior ganglion

Question 35

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

Answer 35

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

Question 36

Where does the recurrent laryngeal nerve supply motor fibers to

Answer 36

All muscles of larynx except the cricothyroid

Question 37

Where does the recurrent laryngeal nerve carry sensory info from

Answer 37

The larynx inferior to vocal folds

Question 38

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

Answer 38

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

Question 39

What does the inferior laryngeal nerve supply

Answer 39

Laryngeal musculature

Question 40

Where does the right recurrent laryngeal nerve pass

Answer 40

Posteriorly under the subclavian artery before ascending

Question 41

What do the superior and inferior cardiac branches carry

Answer 41

Parasympathetic information to the cardiac plexus

Question 42

Where do the superior branches of the cardiac branch go

Answer 42

Leave vagus nerve and travel with great vessels to cardiac plexus

Question 43

Where do branches of inferior cardiac branches go

Answer 43

Given off by recurrent laryngeal nerves and travel to cardiac plexus

Question 44

What is unique about the superior and inferior cardiac branches

Answer 44

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

Question 45

What is the path of vagus before contributing to pulmonary plexus

Answer 45

Enters thorax pass posterior to the root of ipsilateral lung

Question 46

What is path of vagus near the esophagus

Answer 46

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

Question 47

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

Answer 47

Through esophageal opening becoming posterior vagal trunk

Question 48

What does the right vagus do after entering abdominal cavity

Answer 48

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

Question 49

Where does the large celiac branch send branches to

Answer 49

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

Question 50

What makes up the superior messenteric plexus

Answer 50

Small intestine, and proximal 2/3 large intestine

Question 51

What makes up the celiac plexus

Answer 51

Duodenum, liver, Small intestine

Question 52

What does the left vagal nerve become after entering abdominal cavity

Answer 52

Anterior vagal trunk

Question 53

Where does the anterior vagal trunk send branches to

Answer 53

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

Question 54

What is bilateral transection

Answer 54

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

Question 55

What would lesions within the vault or close to skull produce

Answer 55

Widespread problems especially related to palate, pharynx, larynx

Question 56

What would damage to the recurrent laryngeal nerve produce

Answer 56

Speech issues like hoarseness or decreased volume of speech