unit 4: CN X, vagus

Question 1

as a mixed cranial nerve, the vagus carries ___, ___, & ___ info as well as some ____ info from the epiglottal region

Answer 1

motor
parasympathetic
sensory
taste

Question 2

the vagus is the most important ____ nerve

Answer 2

parasympathetic

Question 3

MOTOR nucleus of origin of the vagus

-is somatotopically organized, w/ info from both hemispheres

Answer 3

nucleus ambiguus

Question 4

preganglionic parasympathetic nucleus of origin, which receives info indirectly from the hypothalamus & carotid sinus

Answer 4

posterior (dorsal) nucleus of vagus

Question 5

there are two nuclei of termination for the vagus:

• somatic sensory info terminates in the ______
• taste & viscerosensory info terminate in the ____

Answer 5

• spinal nucleus of CN V

- solitary nucleus

Question 6

two peripheral ganglion that are associated with the vagus nerve
-not to be confused with those of the same name of the glossopharyngeal nerve

Answer 6

superior ganglion (*of the vagus*)
inferior ganglion (*of the vagus*)

Question 7

somatic sensory info is carried in neurons whose cell bodies are located in the

Answer 7

superior ganglion

Question 8

somatic sensory info is carried to from the

• dura
• auricle
• external auditory canal
• lateral tympanic membrane
• oropharynx & laryngopharynx mucusa
• -to terminate in this nucleus:

Answer 8

spinal nucleus of the trigeminal

Question 9

taste from the epiglottis terminates in the SUPerior part of the ____ ____, by neurons with CB in the _____ ____

Answer 9

solitary nucleus

inferior ganglion

Question 10

visceral sensory info terminates in the INFerior part of the ____ ____, by neurons w CB in the ___ ___

Answer 10

solitary nucleus

inferior ganglion

Question 11

the vagus carries ___ ___ info from the larynx, laryngopharynx, viscera in the thoracic & abdominal cavities, ___ receptors in the aortic arch, & ____receptors in the para-aortic body

Answer 11

visceral sensory
pressure
chemo

Question 12

the apparent origin of the vagus nerve, where it emerges as a series of rootlets

Answer 12

lateral aspect of medulla oblongata

Question 13

the vagus trunk exits the skull through the __ __, which is compartmentalized by a fibrous septum

Answer 13

jugular foramen

Question 14

a meningeal branch is given off before the vagus exits the jugular foramen and it supplies the:

Answer 14

infratentorial dura of the posterior cranial fossa

Question 15

the vagus & accessory nerves travel ___ to the fibrous septum of the jugular foramen, while the glossopharyngeal travels ____
-the vagus and accessory also share a meningeal sheath

Answer 15

anterior

posterior

Question 16

the ____ ganglion is located IN the jugular foramen, while the larger ___ ganglion is located INFERIOR to the jugular foramen

Answer 16

superior

inferior

Question 17

the auricular branch is given off the vagus at the superior ganglion, and travels through the ____ ____ & ___ ____ to reach the external auditory meatus

Answer 17

mastoid canaliculus

tympanomastoid fissure

Question 18

the auricular branch carries sensory info from these two places

Answer 18

meatus

small portion of the auricle

Question 19

after exiting the jugular foramen, the vagus travels inferiorly w/i the carotid sheath bt the __ __ artery & ___ ____ vein

Answer 19

internal carotid

internal jugular

Question 20

inferior to the carotid bifurcation, the vagus will travel between the __ __ vein and ___ __ artery

Answer 20

internal jugular

common carotid

Question 21

branches of the vagus that are given off in the neck (5)

Answer 21

pharyngeal
branches to carotid
superior laryngeal
recurrent laryngeal
superior & inferior cervical cardiac branch

Question 22

the ___ branch of the vagus comes of at the inferior ganglion and combines w glossopharyngeal fibers and sympathetic fibers from the sympathetic trunk to form the ___ plexus

Answer 22

pharyngeal

pharyngeal

Question 23

pharyngeal (vagal) motor fibers will supply the (2):

Answer 23

pharyngeal constrictor muscles

levator veli palatine muscle (of soft palate)

Question 24

vagal branches that relay viscerosensory info from chemoreceptors in the carotid body TO the inferior part of the solitary nucleus
-given off in inferior ganglion

Answer 24

branches to carotid artery

Question 25

vagal nerve that is given off inferior to inferior ganglion and splits into an internal and external branch

Answer 25

superior laryngeal nerve

Question 26

the EXTERNAL laryngeal nerve provides MOTOR supply to the

Answer 26

cricothyroid muscle | -tighten/elongates vocal folds

Question 27

the INTERNAL laryngeal nerve carries SENSORY info from

Answer 27

laryngeal mucosa (up to the vocal folds)

Question 28

the *recurrent* laryngeal nerve supplies MOTOR fibers to

Answer 28

all muscles of larynx EXCEPT cricothyroid - thyroarytenoid - posterior cricoarytenoid - lateral cricoarytenoid - arytenid muscles

Question 29

the *recurrent* laryngeal carries SENSORY info from the

Answer 29

larynx, inferior to vocal folds

Question 30

-on the LEFT side: the recurrent laryngeal comes off after the vagus passes _____ the aortic arch, it then passes ____ the aortic arch and ascends to become the ___ ____ nerve

Answer 30

in front of under inferior laryngeal

Question 31

the inferior laryngeal nerve supplies

Answer 31

laryngeal musculature

Question 32

-on the RIGHT side: | the recurrent laryngeal nerve passes _____ under the _____ artery before ascending similarly to the left

Answer 32

posteriorly | subclavian

Question 33

the superior & inferior *cervical cardiac branches* carry PARA info to the ___ ___

Answer 33

cardiac plexus

Question 34

the ____ cardiac branches leave the vagus and travel with the great vessels (IVC, aorta) to the cardiac plexus

Answer 34

superior

Question 35

the ___ cardiac branches are given off by the *recurrent laryngeal* and travel to cardiac plexus

Answer 35

inferior

Question 36

one cervical cardiac branch will carry *viscerosensory* info of pressure on the wall of the aorta, and will be stimulated when ___ ___ becomes to high

Answer 36

aortic pressure

Question 37

after the vagus nerves enter the thorax, they pass posterior to the root of the ipsilateral lung and contrib to the ____ plexus

Answer 37

pulmonary

Question 38

at the pulmonary plexus, the RIGHT vagus passes ____ and the LEFT vagus passes ____ over the esophagus, to contrib to the esophageal plexus

Answer 38

posteriorly | anteriorly

Question 39

the ANTERIOR pulmonary plexus receives fibers from:

Answer 39

CERVICAL sympathetic ganglia

Question 40

the POSTERIOR pulmonary plexus receives fibers from

Answer 40

THORACIC ganglia

Question 41

the RIGHT vagus enters the abdom cavity thru the esophageal opening and becomes the ____ vagal trunk, which sends branches to the posterior stomach

Answer 41

posterior

Question 42

the POSTERIOR vagal trunk terminates in a celiac branch that sends branches to the (5):

Answer 42

``` duodenum liver kidneys SI proximal 2/3 of LI ```

Question 43

the posterior vagal trunk reaches its organs via these three plexuses, which carry preganglionic PARA & sensory info

Answer 43

celiac superior mesenteric renal

Question 44

the LEFT vagus becomes the ___ vagal trunk after endering the abdom cavity thru the esophageal opening

Answer 44

anterior

Question 45

the ANTERIOR vagal trunk sends branches to the (5):

Answer 45

``` stomach liver pancreas superior duodenum spleen ```