The structure that forms the "roof" of the organ of Corti is the

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The tectorial membrane is a gelatinous structure that sits above the sensory hair cells of the organ of Corti and forms the "roof" of the cochlear duct. It is important in the process of auditory transduction, as it responds to vibrations caused by sound waves and helps deflect the hair cells to activate neural signals. The other structures listed (basilar membrane, stapedius, perilymph, and endolymph) are all important components of the inner ear, but they do not form the roof of the organ of Corti.

The Structure That Forms the "Roof" of the Organ of Corti