Which structure is associated with the initial processing of hearing within the inner ear?

Which structure is associated with the initial processing of hearing within the inner ear?

• A. Eardrum
• B. Organ of Corti
• C. Pinna
• D. Semicircular canals

Answer: (B)

The Organ of Corti is the structure responsible for the initial processing of hearing within the inner ear. Located in the cochlea, it houses hair cells on the basilar membrane. When sound causes a traveling wave in the cochlear fluid, the basilar membrane moves and deflects the hair cell stereocilia. This mechanical movement opens ion channels, generating receptor potentials and triggering neurotransmitter release to the auditory nerve fibers. This is the first step that converts sound vibrations into neural signals. The other listed structures aren’t involved in the initial auditory transduction inside the inner ear: the eardrum (tympanic membrane) is in the middle ear, the pinna is part of the outer ear, and the semicircular canals are for balance.

The Organ of Corti is the structure responsible for the initial processing of hearing within the inner ear. Located in the cochlea, it houses hair cells on the basilar membrane. When sound causes a traveling wave in the cochlear fluid, the basilar membrane moves and deflects the hair cell stereocilia. This mechanical movement opens ion channels, generating receptor potentials and triggering neurotransmitter release to the auditory nerve fibers. This is the first step that converts sound vibrations into neural signals. The other listed structures aren’t involved in the initial auditory transduction inside the inner ear: the eardrum (tympanic membrane) is in the middle ear, the pinna is part of the outer ear, and the semicircular canals are for balance.