**5.2 Cochlea**

Cochlea is a coiled hollow bony structure that is lined by epithelial tissue. Despite being a bone, it is requisite for hearing and transduction as part of the auditory system. It is named after the Greek word 'kokhliās', meaning snail, due to its coiled shape (**Figure 3A**). This spiral shape of the cochlea helps it to differentiate between different frequencies because the different but specific region of the cochlear spiral detects different frequencies. Cochlea consists of three canals lined by epithelial cells that are filled with fluids. It also has the organ of Corti, which is a sensory organ that converts sound energy into neural signals that are conducted through the nerve fibers to the brain [29–31].
