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Physiology of hearing and hearing loss

Question
9 out of 39
 

Movement of stapes causes vibration in: (LQ)



A Scala media
B Scala tympani

C Scala vestibuli
D Semicircular canal

Ans. C Scala vestibuli

Friends, first let us quickly revise what is scala vestibuli, tympani and scala mediA.

Scala Vestibuli

It is filled with perilymph.

At one end it is closed by footplate of stapes and at the other end it continues with scala tympani via the helicotremA. (So obviously even without any further knowledge we can say, by common sense that movement of stapes will cause movements in scale vestibuli).

Scala Tympani

It is filled with perilymph.

At one end it is closed by secondary tympanic membrane of round window and at one end it is connected to scala vestibuli v,ia the helicotremA.

It is also connected to subarachnoid space by aqueduct of cochlea

Diagrammatic representation of perilymphatic system. CSF passes into scala tympani through aqueduct of cochlea.

11.jpg

Scala Media

It is membranous cochlea and is filled with endolymph

It appears triangular on cross section and has three walls formed by:

a. The basilar membrane, which supports the organ of Corti

b. The Reissner membrane, which separates it from the scala vestibuli

c. The stria vascularis, which contains vascular epithelium and is concerned with secretion of endolymph.

Physiology of hearing and hearing loss Flashcard List

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