Sensory Cranial Nerves - V, VII, VIII, IX, X Flashcards Preview

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Flashcards in Sensory Cranial Nerves - V, VII, VIII, IX, X Deck (43)
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From the dorsal and ventral cochlear nuclei, what two structures do auditory afferents pass through to reach the auditory cortex (Heschel's gyrus, transverse gyrus in temporal lobe)

Inferior colliculus---> medial geniculate body (auditory thalamus)


The vestibular division of CN VIII is responsible for what three functions?

1. Adjustment of posture
2. Regulating muscle tone
3. Coordination of eye movements


What ganglion do vestibular hair cells synapse on?

Vestibular (Scarpa's) ganglion --> these send their axons in the vestibular division of the vestibululocochlear nerve


Axons leaving the vestibular ganglion synapse in the vestibular nuclei, which four are there?

Superior, lateral, medial, inferior


What are the 2 functions of the lateral vestibulospinal tract, coming from the lateral vestibular nucleus?

Controls balance and extensor tone


What is the function of the medial vestibulospinal tract that arises from the medial and inferior vestibular nuclei?

Controls head and neck position (only extends to cervical levels of the cord)


What is the function of the medial longitudinal fasciculus, which arises from medial and superior vestibular nuclei?

Is important for coordinating eye movements


Afferents from carotid sinus (baroreceptors) and carotid body (chemoreceptors) are carried by CN IX and project to where (what nucleus)?

Caudal part of the solitary nucleus and tract


From where does CN X carry info from baroreceptors and chemoreceptors ?

Aortic arch


From where does CN X carry protopathic info from?

Small portion of external ear; also from posterior meninges


What CN mediates the afferent limb of the gag reflex? To what nucleus do they project?

CN IX --> caudal solitary nucleus


In which nucleus is the interneuron between the afferent and efferent parts of the Gag reflex?

Nucleus ambiguous


What CN mediates the efferent response of the gag response?

CN X (motoneurons from N. Ambiguous whose axons travel with CN X)