What structure contains the organ of Corti and hair cells?

The cochlea is the structure that contains the organ of Corti and hair cells. The organ of Corti is situated within the cochlear duct of the cochlea and is essential for the process of hearing. It contains the sensory cells (hair cells) that convert sound vibrations into electrical signals, which are then transmitted to the brain via the auditory nerve.

In this spiral-shaped structure, sound waves cause fluid movement within the cochlea, allowing the hair cells to detect different frequencies of sound. The organization of the organ of Corti allows it to respond selectively to various pitches, making it a critical component of the auditory system. This intricate arrangement enables the hair cells to play a central role in our ability to hear and interpret sound.

The other structures listed do not contain the organ of Corti or hair cells. The vestibule is involved in balance, the semi-circular canals focus on detecting rotational movements of the head, and the oval window is a membrane that transfers vibrations from the middle ear into the cochlea but does not contain the sensory mechanisms required for hearing.