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This is a high-resolution MRI image demonstrating the normal anatomy of the cochlea in the inner ear.

Let’s begin with the cochlea, labeled here as “Coch.” It’s the spiral-shaped, bony structure that plays a critical role in hearing. The cochlea houses the sensory organ of hearing, the organ of Corti, and converts sound waves into electrical signals.

Next, you’ll see the BM, which stands for the basilar membrane. This membrane runs along the length of the cochlea and vibrates in response to sound. Different parts of the basilar membrane respond to different frequencies, allowing us to perceive a wide range of sounds.

Now look at the CN, or cochlear nerve. This nerve transmits auditory information from the hair cells in the cochlea to the brain. It’s a branch of the vestibulocochlear nerve, also known as cranial nerve VIII.

Just below it, the VN, or vestibular nerve, is visible. This branch of the same cranial nerve carries balance information from the semicircular canals and vestibule to the brain.

Both the cochlear and vestibular nerves travel together through the internal auditory canal before branching out to their respective targets.

The image beautifully shows how these structures sit in close proximity within the temporal bone, and how they function together to maintain our senses of hearing and balance.

Understanding this normal anatomy is essential for interpreting pathologies like vestibular schwannomas, cochlear malformations, or sudden sensorineural hearing loss.