Which structure contains neuronal cell bodies whose axons form the auditory nerve?

Which structure contains neuronal cell bodies whose axons form the auditory nerve?

• A. Spiral ganglion.
• B. Cochlear nucleus.
• C. Tympanic membrane.
• D. Eustachian tube.

Answer: (A)

The strongest concept here is that the cell bodies of the primary auditory neurons reside in a ganglion within the cochlea. These neurons are bipolar, with peripheral processes connecting to hair cells in the organ of Corti and central processes that bundle together to form the cochlear nerve, a part of the vestibulocochlear nerve (cranial nerve VIII) that carries auditory information to the brainstem. The structure that houses these cell bodies is the spiral ganglion. In contrast, the cochlear nucleus sits further along the pathway as a central termination and processing site, not the source of the nerve’s cell bodies. The tympanic membrane and the Eustachian tube are peripheral structures involved in sound transduction and pressure regulation, respectively, and do not contain the neuronal cell bodies that form the auditory nerve.

The strongest concept here is that the cell bodies of the primary auditory neurons reside in a ganglion within the cochlea. These neurons are bipolar, with peripheral processes connecting to hair cells in the organ of Corti and central processes that bundle together to form the cochlear nerve, a part of the vestibulocochlear nerve (cranial nerve VIII) that carries auditory information to the brainstem. The structure that houses these cell bodies is the spiral ganglion. In contrast, the cochlear nucleus sits further along the pathway as a central termination and processing site, not the source of the nerve’s cell bodies. The tympanic membrane and the Eustachian tube are peripheral structures involved in sound transduction and pressure regulation, respectively, and do not contain the neuronal cell bodies that form the auditory nerve.