The cochlear duct, or scala media, is a portion of the cochlea in the inner ear that is filled with a fluid called endolymph. It is surrounded by the scala vestibuli and scala tympani, which are filled with another fluid called perilymph. The cochlear duct houses the sensory cells responsible for detecting sound waves and converting them into electrical signals that can be transmitted to the brain for interpretation. These sensory cells, called hair cells, play a crucial role in our ability to hear and perceive sound.

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