Hearing problems and testing quiz

Basilar membrane

separates scala media from scala tympani

organ of Corti

rests on the basilar membrane

tectorial membrane

located above the outer hair cells 

outer hair cells

sits on the basilar membrane in three rows

inner hair cells

single row of hair cells that rest on basilar membrane

stereocilia

sensory hairs at the top of the IHCs and OHCs

oval window

beyond the stapes footplate

Reissner’s membrane

Separates the cochlear duct from scala vestibuli

scala vestibuli

uppermost chamber filled with perilymph, which is high in sodium; found beyond the oval window 

cochlear duct (scala media)

middle chamber filled with endolymph, which has high potassium

scala tympani

lowest chamber filled with perilymph that ends at round window

round window

opening, covered by a membrane between middle ear and scala tympani

stria vascularis

found in lateral wall of cochlea

spiral ganglia

cell bodies along the modiolus

modiolus

bony structure in center of cochlea

Basilar membrane base

high frequency, thin, stiff

Basilar membrane apex

low frequency, wide, lax

The sensory organ of hearing is the organ of

Corti

This is a cross section of the

cochlea

Endolymph fills this canal in the cochlea

scale media

Three rows are ______, are responsible for generating autoacoustic emissions

outer hair cells

The top of OHCs in the cochlea are known as the _______, which are below the “roof” known as_______

sterocilia, tectorial membrane

The outer hair cells are part of the_____ system

efferent

The inner hair cells are part of the _____ system

afferent

Afferent means sensory information travels

to the brain and spinal cord

The efferent auditory system sends sensory information from the brainstem to the

outer hair cells

Otoacoustic emissions are generated from the

outer hair cells

From the inner hair cells, afferent signals are sent to _____ before the auditory nerve

spiral ganglia

The ____ is the beginning of the central auditory nervous system

cochlear nuclei

Auditory processing and decoding occurs in

Herscl’s gyrus in the temporal lobe

What are otoacoustic emissions (OAEs)?

sounds generated in the cochlea that can be measured in the ear canal and arise from activity of the outer hair cells

How are OAEs generated?

• When sound is presented to the ear canal via a probe, the basilar membrane moves and reaches a peak.

• Outer hair cells have motility 

• lengthen and shorten, controlled by a protein in the cochlea

• voltage changes (because of ion current flow) produced by a traveling wave