16 Sensory Cranial Nerves

Question 1

What is rostral part of nucleus solitarius involved in?

What is caudal part associated with?

Answer 1

rostral part = taste (CN VII, IX, and X)

Caudal part = cardiorespiratory inputs

Question 2

What is anosmia?

Answer 2

marked loss of smell

Question 3

Where do optic tracts go after passing optic chiasm?

Answer 3

runs along outside of mesencephalon to lateral geniculate body, which then projects to primary visual cortex.

Some optic nerve fibers bypass the LGN and ravel to the brachium of the superior colliculus to synapse in superior colliculus. (important for startle reflex)

Question 4

What are the branches of CN V?

Answer 4

V1 = opthalmic, V2 = maxillary, V3 = mandibular

Question 5

What innervates back of head?

Answer 5

spinal nerves from C2

Question 6

Where is the chief sensory nucleus located? What type of info does it receive?

Answer 6

rostral pons. Recieves epicritic inputs (fine touch and vibration from face)

Question 7

Chief sensory nucleus recieves epicritic input from face. What is the analagous structure for epicritic input from body?

Answer 7

posterior column nuclei

Question 8

Which nucleus contains the proprioceptive afferents from the muscles of mastication?

Answer 8

mesencephalic nucleus of CN V

Question 9

Which nucleus becomes continuous with substantia gelatinaosa?

Answer 9

spinal nucleus of V

Question 10

What does spinal nucleus of V recieve?

Answer 10

inputs from pain and temperature afferents from face from CN V, VII, IX, and X

Question 11

Where do pain and temeprature afferents in branches of V have thier cell bodies?

Answer 11

trigeminal ganglion

Question 12

What connects the chief sensory nucleus of V to the ventroposteromedial nucleus (VPM)? What is the analogous structure for spinal pathways?

Answer 12

trigeminal leminiscus.

Medial leminiscus is for spinal pathways

Question 13

Are propioceptive afferent cell body projections of mesencephalic nucleus of V to trigeminal motor nucleus ipsilateral, contralateral or bilateral?

Answer 13

bilateral

Question 14

Which CNs are associated with the gustatory nucleus (rostral nucleus solitarius)?

Answer 14

CNs VII, IX, and X

Question 15

Where are cell bodies of auditory afferents located?

Answer 15

spiral ganglion

Question 16

Where do cochlear nerve fibers synapse?

Answer 16

in ipsilateral dorsal and ventral cochlear nuclei, which then ascend bilaterally to inferior colliculus, which then project to medial geniculate body, whic hten goes to auditory cortex (heschel gyrus)

Question 17

What is scarpa’s ganglion?

Answer 17

another name for vestibular ganglion.

Question 18

What are the four vestibular nuclei and what do they each give rise to?

Answer 18

lateral -> lateral vestibulospinal tract (descending motor pathway for balance and extensor tone)
medial and inferior vestibular nuclei -> medial vestibulospinal tract (head and neck position)

medial and superior vestibular nuclei –> medial longitudinal fasciculus (MLF, coordinating eye movments)

Question 19

Where does CN IX carry taste info from?

Answer 19

taste from posterior 1/3 of tongue as well as somatic (not taste) sensation from pharynx

Question 20

Which CN provides afferents for chemo and baroreception from carotid sinus and carotid bodies?

Answer 20

CN IX

Question 21

Which CN provides fine touch and pain/temperature from middle ear and part of external ear?

Answer 21

CN IX

Question 22

What nucleus does info from carotid body and sinus travel to?

Answer 22

caudal part of solitary nucleus

Question 23

What nucleus do pain and temp afferents from posterior 1/3 of tongue travel to?

Answer 23

spinal tract and nucleus of V via CN IX

Question 24

What nucleus do afferents for epicritic touch from posterior 1/3 of tongue travel to?

Answer 24

Chief sensory nucleus of V