The flat, flexible and skin-covered part located on both sides of the head is called pinna. It is funnel-shaped, hairy and composed of cartilage. Its length is 6-6.4 cm and width is 3 cm. It has a small and round hole. The eardrum consists of several cochlear muscles. Pinna cannot be moved because the muscles are not contractile. Because of this, to hear a sound well, the head along with the ear hole has to be turned towards the sound. Sound is transmitted to the external auditory meatus through the pinna.