Mod4Q1 Flashcards
energy transducer
mechanism for converting energy from one form to another
outer ear
pinna and ear canal; gathers and directs sound
external auditory meatus (EAM)
external ear canal, terminating at tympanic membrane
cartilaginous EAM
lateral 1/3 of canal; approx. 8mm
osseus EAM
medial 2/3 of canal
tympanic membrane
eardrum; transmits sound energy to ossicular chain
speculum
instrument used to examine orifices and canals
middle ear
everything from tympanic membrane to cochlea
ossicles
bones of the middle ear
malleus
“hammer”; first bone of ossicular chain
incus
“anvil”; middle bone of ossicular chain
stapes
“stirrup”; final bone of ossicular chain
base or footplate of stapes
rests in the oval window; flat bottom part of “stirrup”
oval window
opening into the scala vestibuli (vestibular duct) to which the stapes is attached
serous otitis media
infection of the middle ear
middle ear effusion
fluid buildup in middle ear does not allow vibration of tympanic membrane
round window
opening between the scala tympani and the middle ear
What are the functions of the pinna (auricle)?
gathers and directs sound
What is the function of the cerumen (earwax)?
removes debris, keeps foreign bodies out
What is the function of the ossicular chain?
translates sound energy from tympanic membrane to inner ear
What is the ordering of the bones of the ossicular chain from lateral to medial?
malleus, incus, stapes
