16 Sensory Cranial Nerves Flashcards
What is rostral part of nucleus solitarius involved in?
What is caudal part associated with?
rostral part = taste (CN VII, IX, and X)
Caudal part = cardiorespiratory inputs
What is anosmia?
marked loss of smell
Where do optic tracts go after passing optic chiasm?
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)
What are the branches of CN V?
V1 = opthalmic, V2 = maxillary, V3 = mandibular
What innervates back of head?
spinal nerves from C2
Where is the chief sensory nucleus located? What type of info does it receive?
rostral pons. Recieves epicritic inputs (fine touch and vibration from face)
Chief sensory nucleus recieves epicritic input from face. What is the analagous structure for epicritic input from body?
posterior column nuclei
Which nucleus contains the proprioceptive afferents from the muscles of mastication?
mesencephalic nucleus of CN V
Which nucleus becomes continuous with substantia gelatinaosa?
spinal nucleus of V
What does spinal nucleus of V recieve?
inputs from pain and temperature afferents from face from CN V, VII, IX, and X
Where do pain and temeprature afferents in branches of V have thier cell bodies?
trigeminal ganglion
What connects the chief sensory nucleus of V to the ventroposteromedial nucleus (VPM)? What is the analogous structure for spinal pathways?
trigeminal leminiscus.
Medial leminiscus is for spinal pathways
Are propioceptive afferent cell body projections of mesencephalic nucleus of V to trigeminal motor nucleus ipsilateral, contralateral or bilateral?
bilateral
Which CNs are associated with the gustatory nucleus (rostral nucleus solitarius)?
CNs VII, IX, and X
Where are cell bodies of auditory afferents located?
spiral ganglion
Where do cochlear nerve fibers synapse?
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)
What is scarpa’s ganglion?
another name for vestibular ganglion.
What are the four vestibular nuclei and what do they each give rise to?
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)
Where does CN IX carry taste info from?
taste from posterior 1/3 of tongue as well as somatic (not taste) sensation from pharynx
Which CN provides afferents for chemo and baroreception from carotid sinus and carotid bodies?
CN IX
Which CN provides fine touch and pain/temperature from middle ear and part of external ear?
CN IX
What nucleus does info from carotid body and sinus travel to?
caudal part of solitary nucleus
What nucleus do pain and temp afferents from posterior 1/3 of tongue travel to?
spinal tract and nucleus of V via CN IX
What nucleus do afferents for epicritic touch from posterior 1/3 of tongue travel to?
Chief sensory nucleus of V
