chapter 14 vestibular

utricle and saccule

utricle and saccule

otolith organs

head tilt

what do otolith organs respond to

rotation of head

what do semicircular canals respond to

ampullae

jug-like swellings below semicircular canals

utricle saccule and ampullae

where are vestibular hair cells located

same direction

what direction are hair cells polarized in ampullae

opposing

what direction are hair cells polarized in utricle and saccule

striola

what divides the opposite polarized cells in saccule and utricle

macula

sensory epithelium in otolith organs

otolithic membrane

membrane above hair cells in otolith organs

vestibular nerve fibers

what innervates otolith organs

vertical movement

what does saccule detect

horizontal movement

what does utricle detect

crista

sensory epithelium in ampullae

cupula

gelatinous mass that holds hair bundles

in the opposite direction

if head moves in one direction, where does the endolymph move the cupula

semicircular canals and otolith organs

distal processes (such as head movement) innervate what

vestibular nuclei via cranial nerve eight

central processes (such as eye movement) innervate what

medial vestibulospinal pathway

what pathway innervates medial vestibular nucleus via medial longitudinal fasciculus

lateral vestibulospinal pathway

what pathway innervates lateral vestibular nucleus

VOR

excitatory input from canal on one side produces eye movement toward opposite side