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Home  >>  JEEMAIN and AIPMT  >>  Biology  >>  Human Physiology
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The membranes constituting cochlea, the ______________ (A) and ____________ (D), divide the surounding perilymph filled bony labyrinth into _____________________ (G) and _____________________ (E). The space within cochlea called __________________ (B) is filled with endolymph.

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( a ) reissner’s and basilar; an upper scala tympani and a lower scala vestibuli; scala media
( b ) basilar and reissner’s ; an upper scala tympani and a lower scala vestibuli; scala media
( c ) reissner’s and basilar; an upper scala vestibuli and a lower scala tympani; scala media
( d ) basilar and reissner’s ; an upper scala vestibuli and a lower scala tympani; scala media
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1 Answer

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(C) is the right answer.

The fluid-filled inner ear called labyrinth consists of two parts, the bony and the membranous labyrinths. The bony labyrinth is a series of channels. Inside these channels lies the membranous labyrinth, which is surrounded by a fluid called perilymph. The membranous labyrinth is filled with a fluid called endolymph. The coiled portion of the labyrinth is called cochlea. The membranes constituting cochlea, the reissner’s and basilar, divide the surounding perilymph filled bony labyrinth into an upper scala vestibuli and a lower scala tympani. The space within cochlea called scala media is filled with endolymph. At the base of the cochlea, the scala vestibuli ends at the oval window, while the scala tympani terminates at the round window which opens to the middle ear.
answered Mar 26, 2014 by pady_1
 

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