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(B) The cochlea is a coiled structure of the inner ear. $A$ cross-section of the cochlea reveals three fluid-filled chambers or canals:$1$. The upper

Vedclass · Accepted Answer

$P$: Scala vestibuli,$Q$: Scala media,$R$: Scala tympani

Vedclass · Answer

(B) The cochlea is a coiled structure of the inner ear. $A$ cross-section of the cochlea reveals three fluid-filled chambers or canals:$1$. The upper chamber is the $Scala$ $vestibuli$ (labeled $P$ in the diagram).$2$. The middle chamber is the $Scala$ $media$ (labeled $Q$ in the diagram),which contains the organ of Corti.$3$. The lower chamber is the $Scala$ $tympani$ (labeled $R$ in the diagram).Therefore,the correct sequence is $P$: $Scala$ $vestibuli$,$Q$: $Scala$ $media$,$R$: $Scala$ $tympani$.

The following figure shows a cross-section of the cochlea. Identify the canals labeled $P$,$Q$,and $R$.

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