CN V Flashcards
where does VIII exit the brainstep
at cerebellar-pontine angle with CN VII
what fibers are found in cochlear n
SSA
cochlear ganglian contain what type of neurons
bipolary sensory primary neurons
how is the cochlear ganglion unique
cell bodies are scattered around isntead o fclustered
where aer second order fibers of cochlear nuclei found
dorsal acoustic stria and ventral acoustic stria
course of dorsal acoustic stria
ascend in lateral lemniscus
terminate in inferior collili
what are the 3 places that the entral acoustic stria terminates
lateral lemnisus to terminate at inferior colliculi
olivary nuclei
medial nucleus of trapezoid body
first and second order cochlear neurons carry infromatino from what
ipsilateral ear
where are third order cochlear neurons housed
lateral superior auditory nucleus
how are third order cochlear neurons different from first and second order
they are multisynpatic and bilateral
superior colliculi function in what sense
vision
inferior colliculi function in what sense
hearing
function of brachium of inferior colliculus
allow quick connection between hearing and vision
sound attenuation reflex causes what
contractino of tensor tympani and stapedius to dampen auditory input
pathway of first order neurons in sound attenuation reflex
bipolar neurons pick up signal in organ or corti
carry signal to ipilateral ventral cochlear nucleus
pathway of second order neurons in sound attutation reflex
stay ipsilater or decussate
synpase bilaterally in the superior olivary nuclei
pathway of third order neurons in sound attenuation reflex
terminate in trigeminal motor nucleus or facial nucles
what happens when third order neurons reach trigemnal motor nucleus
axons go to tensor tympani m, cause contraction to brace the tympanic membrane
what happens when third order enurons reac the facial nucleus
axons go to stapedius m, cause contraction to brace stapes
what type of fibers does vestivular n carry
SSA
where is vestidcular ganglion located
proximal to vestibular apparist
proximal processes of first order vestibular neurons comes from
cristae of semicircular canal ampulla or hair cells
where do central processes of first order vestibular n terminate
4 vesticular nucli or ipsilateral flocculonodular lobe of cerebellum
what is unique about CN VIII
only CN that sends primary fibers to cerebellum
where are vestibbular second order neurons
4 vestibular nuclei
where do second order vestibular neurons send axons to
MLF
where do second order vestibular neurons terminate
extraocular muscle nuclei, reticular formation, cervical spinal cord, cerebellum, thalamus
where are thrid order vestibular neurons foudn
thalmus (sepcially VPL and VPI nuclei)
where do third order vestibular neurons terminate
primary vestibular cortexx
where do the input to the vesitbular nuclei comes from
vestibular n
cerebellum
contralateral vestibular nuclei
spinal cord
where do the output from the vestibular nuclei come from
extraocular muscle nuclei
contralateral vestibular nuclei
cerebellum
brainstem reticular formation
what are the function components of CN IX
SVE SVA GVE GVA GSA
function of GVE in CN IX
parasympahtheitcs to parotid gland
function of GVA in CN IX
visceral sensory info from nasopharygeal tube, palatine tonsiles
baroreceptors from carotid sinus
function of SVA in CN IX
taset from posterior 1/3 of tongue
function of SVE in CN IX
skeletal motor innervatino of stylopharyngeaus muscle
function of GSA from CN IX
senosry info from ear, ear canal, and posterior 1/3 of tongue
what are the sensory ganglia of CN IX
superior and inferio
superior ganglia of CN IX
pseudounipolar nerousn from GSA branches
path of superior ganglia of CN IX
central processes descned in spinal trigeminal trac tto spintal trigeminal nucleus
inferior ganglia of CN IX
pseudounipolar neurons from GVA and SVA branches
path of inferior ganglia of CN IX
central processes travel in solidtary tract and terminate in solitary nucleus
what is the parasympathteic ganglia of CN IX
otic
functino of otic ganglia
contain postganglionic parasympahteic neurons which terminate in partoid galnd
frey’s syndrome is caused by what
damage to auriculotemporal n following facial surgery
symptom of frey’s syndrome
sweating response to food instead of salvtory response
nucleus ambiguss contains cell bodies of waht
SVE
functino of nucleus ambiggus
tenses styopharyngeus muscle during swallowing
lesion of IX causes what deficits
loss of taste decrease in salivary secretion diminished visceral sensation loss of gag reflex loss of carotid sinus reflex
what are the function compoents of CN X
SVE SVA GVE GVA GSA
functino of SVE in CN X
nerve of 4th pharyngeal arch
function of SVA in CN Xq
taste from epiglottis, soft palate, upper phaynx
function of GVE in CN X
parasymphateics to thoracic and abdominal viscera
function of GVA in CN X
chemrocepetors from carotid body
function of GDA in CN X
sensory info from outer ear, external acoustic meauts, posterior 1/3 of dura
unilateral lesion of bagus nerve root causes
flaccid paralysis or weakness dyspnea loss of gag reflex (efferent limb) loss of general sensation cardiac arrhythmia
bilateral lesion of bagus nerve root causes
death
