(C) The $scala$ $\text{vestibuli}$ and $scala$ $\text{tympani}$ are filled with perilymph. These two chambers communicate with each other at the apex

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(C) The $scala$ $\text{vestibuli}$ and $scala$ $\text{tympani}$ are filled with perilymph. These two chambers communicate with each other at the apex of the cochlea through a small opening known as the $helicotrema$. Therefore, the $scala$ $\text{vestibuli}$ is connected with the $scala$ $\text{tympani}$.