Sensory CN IX and X Overview

Question 1

Question 2

Afferents of pain and temp from the posterior third of the tongue, tonsil, skin of the outer ear, internal surfaces of the tympanic membrane, and pharynx synapse where?

Answer 2

spinal trigeminal nucleus

Question 3

Where do efferents go from the spinal trigeminal nucleus?

Answer 3

second-order neurons travel in the contralateral anterior trigeminothalamic tract and terminate in the VPM of the thalamus

Question 4

Afferents including discriminative touch from the posterior third of the tongue, tonsil, skin of the outer ear, internal surface of the tympanic membrane, and pharynx synapse where?

Answer 4

the chief sensory nucleus of V

Question 5

Efferents from the the chief sensory nucleus of V go where?

Answer 5

travel in the contralateral trigeminal lemniscus and terminate in the VPM of the thalamus

Question 6

Chemoreceptors and baroreceptors from the carotid body and gag sensations synapse where (afferents)?

Answer 6

nucleus soltarius, middle part

Question 7

Efferents from the middle part of the nucleus soltarius go where?

Answer 7

reflex arcs to the nucleus ambiguus

Question 8

Afferent taste from the posterior 3rd of the tongue synapse where?

Answer 8

the rostral part of the NTS

Question 9

Efferents from the rostral part of the NTS go where?

Answer 9

output to ipsilateral insula

Question 10

The nucleus ambiguus relays what?

Answer 10

bilateral corticobulbar input to perform motor to the stylopharyngeus muscle and

input from the NTS (for reflex) to the carotid body and sinus for vasodilation

Question 11

What does the inferior salivatory nucleus relay?

Answer 11

input from the hypothalamus and olfactory system to stimulate the parotid gland

Question 12

Question 13

Sensory from the posterior meninges, concha, pharynx, and larynx synapse where?

Answer 13

the spinal trigeminal tract

Question 14

Sensory from the larynx, trachea, esophagus, and throacic and abdominal viscers, including stretch receptors in the aortic arch, synapse where?

Answer 14

Nucleus solitarius (and then to the reticular formation and hypothalamus)

Question 15

Pharyngeal muscles and cricothyroid and intrinsic muscles of the larynx are controlled by motor output from CN X. What tract is taken?

Answer 15

from the nucleus ambiguus via the bilateral corticobulbar tract innervation

Question 16

Smooth muscle and glands of the pharynx, larynx, and thoracic and abdominal viscera are controlled by motor output from CN X. What tract mediates this?

Answer 16

the dorsal motor nucleus of the vagus via input from the hypothalamus, olfactory system, and reticular system

Question 17

Control of cardiac muscle is also under control of CN X. How?

Answer 17

input frm the hypothalamus and reticular formation via the nucleus ambiguus

Question 18

Sensory components of CN IX and X:

Taste: posterior 1/3 of tongue (IX) epiglottis and pharynx (X). These project where?

Answer 18

to the gustatory nucleus (anterior portion of the nucleus solitarius)

Question 19

Sensory components of CN IX and X:

Chemo- and baroreceptors in the aortic arch and carotid body. These project where?

Answer 19

to the caudal parts of the nucleus solitarius.

Question 20

Sensory components of CN IX and X:

Afferents for general visceral sense of pharynx and larynx also project where?

Answer 20

to caudal parts of the nucleus solitarius.

Question 21

Sensory components of CN IX and X:

Fine touch, pain and temperature from around the external ear. These project where?

Answer 21

to the nucleus of the spinal tract of the trigeminal nerve