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How does the helicotrema connect the chambers of the cochlea?

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Cross-section diagram of the human ear showing the outer ear, middle ear, and inner ear, with labeled parts including the auricle, auditory canal, tympanic membrane, ossicles, cochlea, semicircular canals, and nerves. — human ear Structure of the human ear.

The cochlea contains two primary chambers filled with perilymph: the upper scala vestibuli and the lower scala tympani. These two compartments are connected at the apex of the cochlea by an opening known as the helicotrema.1