The cochlea is a spiral-shaped, fluid-filled structure located in the inner ear. It plays a crucial role in the process of hearing by converting sound vibrations into electrical signals. These signals are then transmitted to the brain via the auditory nerve, allowing us to perceive sound. Inside the cochlea, there are tiny hair cells that move in response to sound waves. This movement triggers the release of neurotransmitters, which send signals to the brain. The cochlea is essential for our ability to detect different pitches and volumes, making it a vital component of the auditory system.