Physiology Lecture 7- Hearing And

Equilibrium-Balance Test Study Guide

pinna - Answer aurical

external auditory meatus - Answer ear canal

tympanic membrane - Answer ear drum

external ear - Answer pinna, external auditory meatus, tympanic membrane

middle ear - Answer contains 3 bones: ossicles: malleus, incus, stapes;

pharyngotympanic tube (connects middle ear to throat)

inner ear - Answer vestibule, 3 semicircular ducts, cochlea

vestibule - Answer central area; a bony labyrinth; contains: 2 membranous labyrinths

(utricle and saccule), macula, and 2 membrane covered 'windows' (oval window and

round window)

macula - Answer the utricle and saccule each contain a group of neurons called the

3 semicircular canals - Answer these are bony labyrinths; they are oriented at right

angles to each other; the ends next to the vestibule are enlarged = ampullae; inside each

are the membraneous labyrinths (semicircular ducts); in each semicircular duct, there

is a group of neurons = crista ampullaris

ampullae - Answer enlarged portion of the semicircular canals next to the vestibules

semicircular ducts - Answer membraneous labyrinth inside semicircular canals

crista ampullaris - Answer the group of neurons in the semicircular ducts

cochlea - Answer a coiled bony labyrinth; contains: 3 fluid filled chambers: scala

vestibuli, scala tympani, scala media and 2 separating membranes: vestibular

membrane and basilar membrane

scala vestibuli - Answer a fluid filled chamber between the bone and the vestibular

membrane; extends from the oval window to the tip of the cochlea (helicotrema)

scala tympani - Answer a fluid filled membrane between the bone and the basilar

membrane; extends from the tip of the cochlea (helicotrema) to the round window

scala media - Answer a membraneous, fluid filled labyrinth; it contains a group of

neurons = organ of corti

organ of corti - Answer a group of neurons in the scala media