exam 2 vagus nerve

Question 1

what type of information does the vagus nerve carry?

Answer 1

motor, parasympathetic, and sensory information

including some taste from the epiglottal region

Question 2

what are two unique chaacteristics of the vagus nerve?

Answer 2

longest cranial nerve

most important parasympathetic nerve

Question 3

where are the cell bodies for the motor fibers of the vagus nerve located?

Answer 3

in the nucleus ambiguus

Question 4

where does the nucleus ambiguus receive its information from?

Answer 4

both cerebral hemispheres, (its a motor nuclues so from a higher level.)

Question 5

where do the preganglionic parasympathetic fibers of the vagus nerve arise from?

Answer 5

posterior (dorsal) nucleus of the vagus

Question 6

where does the posterior nucleus of the vagus receive its information from?

Answer 6

receives information indirectly from the hypothalamus and carotid sinus

Question 7

incoming somatic sensory information carried in the vagus nerve terminates where?

Answer 7

spinal nucleus of C.N 5

Question 8

taste and viscerosensory information carried in the vagus nerve terminates where?

Answer 8

nucleus of the solitary tract

Question 9

what are the two peripheral ganglia associated with the vagus nerve?

Answer 9

superior and inferior ganglion

NOT the same as glossopharyngeal

Question 10

what is the superior ganglion of the vagus nerve also known as?

Answer 10

the jugular ganglion

Question 11

what is the inferior ganglion of the vagus nerve also known as?

Answer 11

the nodose ganglion

Question 12

sensory information is carried in neurons whose cell bodies are located where?

Answer 12

superior ganglion

Question 13

where does the sensory information of the vagus come from?

Answer 13

Dura (infratentorial/posterior fossa)
auricle
external auditory canal
lateral tympanic membrane
mucosa from the larynx and laryngopharynx
viscera in the thoracic and abdominal cavities
pressure receptors in the aortic arch
chemoreceptors in the para-aortic body

Question 14

taste from the epiglottis is carried by neurons whose cell bodies are located where?

Answer 14

inferior ganglion

Question 15

where does taste from the epiglottis terminate?

Answer 15

superior part of the nucleus of the solitary tract

Question 16

visceral sensory information is carried by neurons in the inferior ganglion to where?

Answer 16

inferior part of the solitary tract

Question 17

the vagus nerve carries visceral sensory information from where?

Answer 17

larynx and laryngopharnx
viscera in the thoracic and abdominal cavities
pressure receptors in the aortic arch
chemoreceptors in the para-aortic body

Question 18

what is the apparent origin of the vagus nerve?

Answer 18

emerges from lateral aspect of the medulla oblongata as a series of rootlets

Question 19

when the rootlets combine and form a trunk what does the vagus nerve do before exiting the skull?

Answer 19

gives off a meningeal branch that supplies the dura of the posterior cranial fossa

Question 20

where does the vagus nerve exit the skull?

Answer 20

jugular foramen

Question 21

what does the meningeal branch supply?

Answer 21

dura of the posterior cranial fossa

Question 22

how is the jugular foramne compartmentalized?

Answer 22

by a fibrous septum

Question 23

what nerves travel anterior to the fibrous septum of the jugular foramen?

Answer 23

vagus nerve

accessory nerve

Question 24

what nerve travels posterior to the fibrous septum of the jugular foramen?

Answer 24

glossopharyngeal nerve

Question 25

what do the vagus and accessory nerve also share during their travels through the jugular foramen?

Answer 25

they share a meningeal sheath (arachnoid and dura)

Question 26

where is the superior ganglion of the vagus nerve located?

Answer 26

jugular foramen

Question 27

where is the inferior ganglion of the vagus nerve located?

Answer 27

just inferior to the jugular foramen (outside)

Question 28

where is the auricular branch of the vagus nerve given off at?

Answer 28

the superior ganglion

Question 29

what two structures does the auricular branch pass through on its way to the external auditory meatus?

Answer 29

mastoid canaliculus and the tympanomastoid fissure

Question 30

what information does the auricular branch carry?

Answer 30

sensory information from the meatus and a small portion of the auricle

Question 31

upon exiting the jugular foramen what does the vagus nerve travel inferiorly in?

Answer 31

the carotid sheath

Question 32

while in the carotid sheath traveling inferior what two structures does it travel between?

Answer 32

internal carotid artery and the internal jugular vein

Question 33

inferior to the carotid bifurcation it will travel between what two structures?

Answer 33

internal jugular vein and common carotid artery

Question 34

where does the pharyngeal branch leave the vagus?

Answer 34

at the level of the inferior ganglion

Question 35

what is the first thing the pharyngeal branch does upon leaving the vagus?

Answer 35

combines with fibers from the glossopharyngeal and with symathetic fibers from the sympathetic trunk

Question 36

when the pharyngeal branch combines with glossopharyngeal and sympathetic trunk it form what?

Answer 36

pharyngeal plexus.. you should already known this

Question 37

vagal fibers of the pharyngeal plexus will provide motor innervation to what?

Answer 37

pharyngeal constrictor muscles and the levator veli palatine muscle of the soft palate

Question 38

what other branches besides the pharyngeal are given off at the inferior ganglion?

Answer 38

branches to the carotid

Question 39

what do the branches of the carotid carry?

Answer 39

they carry viscerosensory fibers that relay information from chemoreceptors in the carotid body

Question 40

where do the branches of the carotid carry the viscerosensory information to?

Answer 40

inferior part of the nucleus for the solitary tract

Question 41

what nerve is given off just inferior to the inferior ganglion?

Answer 41

superior laryngeal nerve

Question 42

what are the two divisions of the superior laryngeal nerve?

Answer 42

external laryngeal nerve | internal laryngeal nerve

Question 43

what does the external laryngeal motor supply?

Answer 43

cricothyroid muscle

Question 44

what does the internal laryngeal nerve sensory supply?

Answer 44

laryngeal mucosa as far inferior as the vocal folds

Question 45

what does the recurrent laryngeal nerve motor supply?

Answer 45

supplies motor fibers to all muscles of the larynx, except the cricothyroid?

Question 46

what nerve supplies the cricothyroid?

Answer 46

external laryngeal nerve

Question 47

what does the recurrent laryngeal nerve sensory supply?

Answer 47

supplies from the larynx inferior to the vocal folds

Question 48

what is the path of the recurrent laryngeal nerve of the left side?

Answer 48

comes off the vagus as it passes in front of the aortic arch, then passes under the aortic arch and ascends, eventually becoming the inferior laryngeal nerve

Question 49

what is the path of the recurrent laryngeal nerve on the right side?

Answer 49

passes posteriorly under the subclavian artery before ascending

Question 50

what fibers do the superior and inferior cervical cardiac branches?

Answer 50

parasympathetic information to the cardiac plexus

Question 51

which cervical cardiac branch travels with the great vessels to the cardiac plexus?

Answer 51

the superior cervical cardiac branch

Question 52

where does the inferior cervical cardiac branch come from?

Answer 52

its a branch off of the recurrent laryngeal nerve

Question 53

one of the cervical cardiac branches will carry viscerosensory information concerning what?

Answer 53

pressure of the wall of the aorta.

Question 54

when is the cervical cardiac branch carrying viscerosensory information of the pressure of the aorta wall stimulated?

Answer 54

the nerve is stimulated when the pressure becomes too high

Question 55

as the vagus nerve enters the thorax and passes posterior to the root of the ipsilateral lung and contributes to what?

Answer 55

pulmonary plexus

Question 56

after entering the thorax and contributing to the pulmonary plexus what is the path variations of the right and left vagus nerve?

Answer 56

the right passes posteriorly and the left passes anteriorly of the esophagus, contributing to the esophageal plexus

Question 57

how does the right vagus nerve enter the abdmonial cavity?

Answer 57

through the esophageal opening

Question 58

what does the right vagus nerve become when it enters the abdominal cavity?

Answer 58

becomes the posterior vagal trunk

Question 59

the posterior vagal trunk sends branches to the posterior stomach which terminate where?

Answer 59

terminates in a large celiac branch

Question 60

where does the large celiac branch send branches to?

Answer 60

duodenum liver kidneys small intestine and proximal 2/3 of the large intestine

Question 61

how does vagal supply reach the organs innervated by the the celiac branch?

Answer 61

through the celiac, superior mesenteric, and renal plexuses

Question 62

what does the left vagal nerve become after entering the abdominal cavity?

Answer 62

anterior vagal trunk

Question 63

how does the left vagus nerve enter the abdominal cavity?

Answer 63

esophageal opening

Question 64

where does the anterior vagal trunk supply?

Answer 64

sends branches to the stomach, liver, pancreas and superior part of the duodenum