The Cochlear Duct, also known as the scala media, is a fluid-filled structure located within the cochlea of the inner ear. It plays a crucial role in the process of hearing by housing the organ of Corti, which contains sensory hair cells that convert sound vibrations into electrical signals for the brain. The Cochlear Duct is surrounded by two other fluid-filled chambers: the scala vestibuli and the scala tympani. It is filled with a special fluid called endolymph, which helps maintain the proper environment for the hair cells to function effectively. This duct is essential for the auditory system's ability to detect and interpret sound.