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B
Tympanum
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C
Cochlea
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D
Pinna
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Solution
The correct option is C Cochlea ∙ Inner ear has two main parts: Cochlea and the semicircular canals. ∙ Cochlea is a spiral-shaped structure. It looks like a snail shell. It has three parallel tubes: Scala vestibuli, scala media and scala tympani. ∙ The scala vestibuli and scala tympani are filled with perilymph, while scala media is filled with endolymph. ∙ Cochlea receives the incoming vibrations from the middle ear and converts them into neural impulses and sends them to the brain.