HW 9

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What is the function of the basilar membrane analogous to?

A bank of band-pass filters

What is the function of the stria vascularis analogous to?

A battery

What are the characteristics of cochlear hearing loss?

A loss of cochlear compression, a reduction in the active process, and a reduction in outer outer hair cell motility.

The basilar membrane vibrates optimally for high-frequency sounds in which specific location?

Base of the cochlea

What is the name of the membrane upon which the organ of Corti sits?

Basilar membrane

What are the support cells?

Boettcher's cells, cladius' cells, and hensen's cells

Where does the scala vestibuli join the scala tympani?

Helicotrema

What are the sensory cells?

Inner hair cells

What are habenula perforata?

Openings in the spiral lamina though which nerve fibers pass

What is the sense organ of hearing?

Organ of Corti

What are the sense organs found in the inner ear?

Organ of Corti, cristae ampullares, and maculae.

Which type of cells have an electromotility function?

Outer hair cells

What is the name of the protein in the wall of the outer hair cell that is responsible for its motility function?

Prestin

What is the name of the upper surface of the organ of Corti?

Reticular lamina

What is an example of direct current potential?

Summating potential

The basilar membrane is thickest in which part of the cochlea?

The apex

What is tonotopicity?

The correspondence between the frequency of a sound and the place along the cochlea that is stimulated.

What is endolymph?

The fluid in the scala media

What are the nonlinear cochlear responses of an active process?

The generation of distortion products, compression, and suppression.

What is the osseous structure in the center of the cochlea?

The modiolus

The organs of hearing and balance are located in which portion of the temporal bone?

The petrous

What membrane separates the scala vestibuli from the scala media?

The reissner

What is endocochlear potential?

The resting potential between the endolymph in the scala media perilymph in the scala vestibuli and scala tympani.

What is cochlear compression?

The shallow, non-linear growth of basilar membrane displacement at mid-to-high stimulus intensities.


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