CSD 460: Exam 1 - Outer Ear

Which auditory system consists of the outer ear, middle ear, inner ear, and the VIIIth cranial nerve?

peripheral auditory system

Which auditory system starts at the cochlear nucleus and stops at the auditory cortex

central auditory system

what is the most visible portion of the ear

pinna

what is the pinna composed of

cartilage and skin

what part of the outer ear blocks out sound

tragus

what are the divisions of the concha

cavum and cymba

what is the upper half of the concha

cymba

wha is the lower half of the concha

cavum

each individual’s pinna is a ___

distinctive acoustic imprint

what are the main purposes of the pinna

localize sound and direct sound into the external ear canal

what part of the ear extends from the chocha to the tympanic membrane

external auditory meatus/canal/ear canal

what is the purpose of the external auditory canal

protect eardrum

what portion of the EAC is cartilaginous

outer

what portion of the EAC is boney

inner

what portion of the EAC contains ceruminous glands and hair follicles?

outer

what is the purpose of cerumen

repel water, trap debris, moisturize epithelium/skin in ear canal, repel bugs, cleanse EAC

inner and outer portions meet at the ____

osseocartilaginous junction

what is known as the protrusion of the mandible

condyle

when the mandible is not aligned, the condyle presses against the osseocartilaginous joint causing ____

tempromandibular joint syndrome

what is known as ear pain

otalgia

what is the border between the middle and outer ear

tympanic membrane/eardrum

the tympanic membrane is rich in what

blood

what are the two divisions of the eardrum

pars tensa and par flaccida

what is the top “half” of the eardrum called

pars flaccida

what is the bottom “half” of the eardrum called

pars tensa

what division of the eardrum has 3 layers

par flaccida

what division of the eardrum has 2 layers

pars tensa

what layers do BOTH the pars flaccida and pars tensa have

cutaneous stratum and mucous stratum

what layer does only the pars flaccida have

fibrous stratum

what layer of the eardrum is the outermost layer and made of skin

cutaneous stratum

what layer of the eardrum contributes to the TM’s ability to vibrate

fibrous stratum

what layer of the eardrum continues into the middle ear

mucous stratum

what ossicle from the middle ear is embedded to the center of the TM

malleus

what is the tip of the malleus that’s embedded into the TM called

umbo

what kind of configuration does the TM have

concave

what is the reflection of light created by the TM called

cone of light

what is a good indication of a healthy TM

cone of light

what holds the TM

annulus

what are the purposes of the eardrum

part of middle ear transformer system and helps with middle ear pressure regulation

what are the primary structures of the outer ear that contribute to resonance

concha and ear canal

air filled cavaties increase sound pressure at its ____

resonant frequency

what part of the ear is this

triangular fossa

what part of the ear is this

antitragus

what part of the ear is this

tragus

what part of the ear is this

antihelix

what part of the ear is this

cavum

what part of the ear is this

cymba

what part of the ear is this

helix

what part of the ear is this

lobe

what part of the ear is this

intertragal notch

what part of the ear is this

concha

what is 1

pinna

what is 2

external auditory canall/ear canal

what is 3

tympanic membrane/eardrum

what part of the ear is this

pars flaccida

what part of the ear is this

pars tensa

what part of the ear is this

umbo

what part of the ear is this

manubrium

what part of the ear is this

cone of light

what part of the ear is this

annulus