At where part is fastest the sound velocity in human ear?

The speed of sound in the human ear is fastest in the cochlea, particularly in the perilymph and endolymph fluids that fill this structure. Sound waves enter the ear through the outer ear, travel through the ear canal, and cause the eardrum to vibrate. These vibrations are then transmitted through the ossicles (tiny bones) to the cochlea, where the fluid's density and properties facilitate the rapid transmission of sound waves. The efficient transfer of sound energy in the cochlea is crucial for hearing.