Auditory/Vestibular Systems Flashcards
the cochlear division of CN VIII is responsible for ____ and the vestibular portion of CN VIII is responsible for _____
hearing; head position and movement
in both hearing and balance, mechanoreceptors called ____ are stimulated
hair cells
auditory and vestibular receptors innervated by CN VIII are located within _____
the petrous portion of the temporal bone
within the temporal bone is space called ____ that suspends a ____
bony tube; membranous tube
the bony labyrinth is composed of:
- vestibule
- 3 semicircular canals
- cochlea
the vestibule is composed of the:
utricle and saccule
perilymph is similar to ____ and is continuous with ____ through the cochlear aqueduct
extracellular fluid; subarachnoid space
cells within the walls of the membranous labyrinth are connected by ____ creating a _____
tight junctions; diffusion barrier
endolymph is more ____ charged and perilymph is more ____ charged
negatively; positvely
endolymph is secreted by cells within the ____ called _____
cochlea; stria vascularis
endolymph flows out through the ____ to the _____ where it is reabsorbed
endolymphatic duct; endolymphatic sac
the endolymphatic sac is located within the _____ and is the site of reabsorption
dura of the temporal bone
blockage of the endolymphatic sac can result in _____, which is thought to be a cause of meniere’s disease
swelling of the membranous labyrinth (endolymphatic hydrops)
auditory and vestibular receptors are called _____ and are located within the ____
hair cells; membranous labyrinth
____ of hair cells project into endolymph (apical projections)
stereocilia
