Which structure is part of the inner ear and is essential for hearing?

• A. Eardrum
• B. Malleus
• C. Cochlea
• D. Semicircular canals

Answer: (C)

Hearing relies on converting sound-induced vibrations into neural signals in the inner ear. The cochlea does this conversion: the fluid inside moves in response to vibrations, hair cells along the basilar membrane bend, and they generate electrical impulses that travel to the brain via the auditory nerve. The semicircular canals, though in the inner ear, sense head movement for balance and don’t detect sound. The eardrum is the boundary between the outer and middle ear and simply transmits vibrations inward, while the malleus is one of the middle-ear bones that help move vibrations toward the inner ear. So, the cochlea is the structure responsible for hearing.