Lecture 6 Flashcards
fn of the semicircular canals
sense rotational movements/acceleration of head
which are the otolith organs
utricle and sacule
fn of utricle and sacule
respond to linear acceleration and static position of head
where are vestibular hair cells found
utricle
saccule
ampullae
where are sensory epithtelial cells for utricle and saccule found
macula
where are sensory epithtelial cells for semicircular canals found
crista
saccular macula is oriented?
vertically
utricular macula is oriented
horizontally
saccular macula respond best to movements that are
linear vertical acceleration (up and down)
utricular macula respond best to movements that are
linear horizontal acceleration (side to side)
importance of striola
divides haircells to have two opposing polarities (one side hyperpols, the other depols)
if stereocilia bend towards kinocilium then (a) takes place
(b) does the firing rate inc or dec
(a) depol
(b) increasing in firing rate
scarpas ganglion projects to
vestibular nuclei of caudal pons and rostral medulla
lateral vestibular nuclei project to
cerebellum
spinal cord
medical vestibular nucleus projects to
extraocular motornuerons neck motorneurons (via medial longitudinal fasciculus)
