lecture 20 - cranial nerves of the medulla

Question 1

What are the 2 roots of the accessory nerve?

Answer 1

Cranial root, spinal root

Question 2

Which cranial nerves arise from the nucleus ambigous?

Answer 2

Vagus nerve, Cranial XI

Question 3

Where does the spinal root of nerve XI arise?

Answer 3

The accessory nucleus in the spinal cord (C1-C5)

Question 4

What does Cranial XI supply?

Answer 4

The muscles of the larynx and pharynx, alongside the vagus nerve

Question 5

What does spinal XI supply?

Answer 5

The trapezius and sternocleidomastoid muscles

Question 6

What are the important nuclei for Cranial nerves X and XI?

Answer 6

Nucleus of tractus solitarius, nucleus ambiguous, superior salivatory, inferior salivatory, dorsal motor nucleus of X

Question 7

What are the functions of the nucleus of tractus solitaius?

Answer 7

T for taste, S for visceral sensation

Question 8

Which cranial nerves are associated with Nucleus of tractus solitarius?

Answer 8

N, T, S = Nine, Ten (X + CrXI), Seven

Question 9

Which cranial nerve supplies taste sensation for the anterior 2/3 of the tongue?

Answer 9

Facial nerve (VII)

Question 10

Which cranial nerve supplies taste sensation for the posterior 1/3 of the tongue?

Answer 10

Glossopharyngeal nerve (IX)

Question 11

Which cranial nerve supplies taste sensation for the epiglottis?

Answer 11

Vagus nerve (X/CrXI)

Question 12

What are the general visceral sensation inputs to the nucleus of tractus solitarius from CNVII?

Answer 12

none

Question 13

What are the general visceral sensation inputs to the nucleus of tractus solitarius from CNIX?

Answer 13

Carotid sinus baroreceptors, carotid body chemoreceptors

Question 14

What are the general visceral sensation inputs to the nucleus of tractus solitarius from CNX and CrXI?

Answer 14

Aortic arch baroreceptors, aortic body chemoreceptors, lung stretch receptors, gut stretch receptors

Question 15

What are the visceral motor nuclei found in the brain stem?

Answer 15

Dorsal Motor X, salivatory nuclei (superior & inferior), Edinger-Westphal nucleus

Question 16

Which cranial nerve is associated with the Inferior salivatory nucleus?

Answer 16

Glossopharyngeal nerve

Question 17

Which cranial nerve is associated with the superior salivatory nucleus?

Answer 17

Facial nerve

Question 18

Which gland is stimulated by activation of CNIX via the inferior salivatory nucleus?

Answer 18

Parotid gland

Question 19

Which glands are stimulated by activation of CNVII via the superior salivatory nucleus?

Answer 19

Sublingual gland, submandibular (‘sup goes to sub’)

Question 20

Which brain stem nucleus has bilateral hemipshere input?

Answer 20

nucleus ambiguus

Question 21

What motor outputs are associated with the nucleus ambiguus?

Answer 21

Muscles of the throat and larynx for talking, swallowing and breathing

Question 22

Why will a unilateral UMN lesions of the nucleus ambiguus cause no major problems?

Answer 22

Because the nucleus receives bilateral hemishperal input,

Question 23

Which cranial nerves are associated with the nucleus ambiguus?

Answer 23

IX, X/CrXI

Question 24

What type of information is conveyed in the nucleus of the spinal tract?

Answer 24

Somatic afferent/sensory

Question 25

What is the primary cranial nerve of the nucleus of the spinal tract?

Answer 25

Trigeminal (V)

Question 26

What are the secondary cranial nerves that carry somatic sensation to the nucleus of the spinal tract?

Answer 26

VII, IX, X, CrXI

Question 27

Which cranial nerves does the gag reflex test?

Answer 27

Glossopharyngeal (IX) (sensation at back of throat), Vagus (X) (motor to muscles of pharynx)