Cranial nerves V Flashcards Preview

Year 1 Neuroanatomy > Cranial nerves V > Flashcards

Flashcards in Cranial nerves V Deck (24)
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1
Q

what is the pathway for first order neurons of the auditory pathway?

A
  1. peripheral processes - receptor hair cells 2. cell bodies - spiral ganglion 3. central processes - form root of cochlear nerve and enters pons, bifurcate and synapse in dorsal and ventral cochlear nuclei
2
Q

what is the pathway for second order neurons of the auditory pathway?

A
  1. cell bodies - dorsal and ventral cochlear nuclei (pons) 2. ventral nucleus axons - ventral stria (trapezoid body) terminate in nucleus of trapezoid body, superior olivary nucleus, nucleus of lateral lemniscus, inferior colliculus 3. dorsal nucleus axons - dorsal stria terminate in inferior colliculus (via lateral lemniscus)
3
Q

where are the third order neurons of the auditory pathway?

A
  1. cell bodies - superior olivary nuclei (localization) 2. carry information from both ears
4
Q

what is the “main pathway” of the auditory system?

A

lateral lemniscus to inferior colliculus

5
Q

what is the input and output of the inferior colliculus?

A
  1. input - lateral lemniscus 2. output - medial geniculate nucleus
6
Q

what is the role of the medial geniculate nucleus? what does it give rise to?

A
  1. processes sound intensity and frequency 2. auditory radiation - projects to auditory cortex
7
Q

what is the role of the primary auditory cortex? secondary?

A
  1. primary - localization of sound, detecting alterations in pattern 2. interpretation of sound, voice, language, music
8
Q

what are the descending auditory projections? what is their role?

A
  1. olivocochlear bundle 2. modulates transmission of auditory input to CNS
9
Q

what is the pathway for first order neurons of the vestibular pathway?

A
  1. peripheral processes - hair cells in maculae of utricle and saccule; cristae of semicircular canal ampullae 2. cell bodies - vestibular ganglion 3. central processes - form root of vestibular nerve, enter pons and bifurcate in vestibular nuclei to go to inferior cerebellar peduncle / flocculonodular lobe of cerebellum
10
Q

what is the pathway for second order neurons of the vestibular pathway?

A
  1. cell bodies - vestibular nuclei 2. axons join medial longitudinal fasciculus to go to eye muscles, reticular formation, cervical spinal cord, cerebellum, thalamus
11
Q

what is the pathway for third order neurons of the vestibular pathway?

A
  1. cell bodies - VPL and VPI nuclei of thalamus 2. project to primary vestibular cortex
12
Q

what is the SVA of CN 9? GSA?

A
  1. SVA - taste from posterior 1/3 of tongue 2. GSA - general sensation from posterior 1/3 of tongue
13
Q

what are the sensory ganglia of CN 9?

A
  1. superior ganglion 2. inferior (petrosal) ganglion
14
Q

what is the pathway of pseudounipolar central processes from the superior ganglion of CN 9?

A

descend in spinal V tract to spinal V nucleus (GSA)

15
Q

what is the pathway of pseudounipolar central processes from the inferior ganglion of CN 9?

A

join solitary tract to terminate in solitary nucleus (GVA, SVA)

16
Q

what is the parasympathetic ganglion of CN 9? what is the course of its postganglionic axons?

A
  1. otic 2. terminate in parotid gland
17
Q

what are the nuclei associated with CN 9?

A
  1. inferior salivatory 2. nucleus ambiguus 3. solitary nucleus
18
Q

what is contained in the inferior salivatory nucleus? where do its axons terminate?

A
  1. cell bodies of preganglionic parasympathetic neurons (GVE)2. otic ganglion
19
Q

what is contained in the nucleus ambiguus?

A

cell bodies of motor neurons

20
Q

what is contained in the solitary nucleus?

A

receives central processes of GVA and SVA neurons

21
Q

what are the nuclei of the vagus nerve? what are their functions?

A
  1. dorsal motor nucleus - parasympathetic 2. nucleus ambiguus - motor (larynx, pharynx) 3. solitary nucleus - taste and visceral sensory; receives fibers from CN 7, 9, 10
22
Q

what are the ganglia of the vagus nerve?

A
  1. superior (jugular) 2. inferior (nodose) 3. parasympathetic
23
Q

what is the pathway of the pseudounipolar central processes of the superior (jugular) ganglion of CN 10?

A

descend in spinal V tract to spinal V nucleus

24
Q

what is the pathway of the pseudounipolar central processes of the inferior (nodose) ganglion of CN 10?

A

join solitary tract to terminate in solitary nucleus