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Physiology of hearing and hearing loss

Question
6 out of 39
 

Endolymph in the inner ear: [AIIMS May 09]



A Is a filterate of blood serum

B Is secreted by stria vascularis

C Is secreted by basilar membrane

D Is secreted by hair cells

Ans. B is secreted by stria vacularis

There are 2 main fluids in the inner ear.

Perilymph

Endolymph

Fills the space between the bony and membranous labyrinth. it is found in scala vestibuli and scala tympani

Fills the entire membranous labyrinth. found in scala media

Resembles extracellular fluid ICSF

Resembles intracellular fluid

Rich in Na ions

Rich in K ions.

Note

Marginal cells in the striae vascularis actively pump potassium into the membranous chamber to mantain the difference in the sodium & potassium concentration.

The difference in the chemical composition between perilymph & endolymph provides the lectrochemical energy which powers the activities of sensory cells.

Also know

Striae vascularis forms the outer wall of scala media and sits within spiral ligament.

Physiology of hearing and hearing loss Flashcard List

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