Functions
The main function of the pinna is to collect sound and direct it into the ear canal; it acts as a filter, in that it selects the sound waves that are with the frequency range of human hearing.
Anatomy
Also known as the external ear, the pinna is the visible portion of the ear of each side of the human head. Anatomically, it is composed of several sections, including the helix (the top curve), the lobe (the fleshy part at the bottom), and the tragus (the smaller flap of cartilage near the opening of the ear canal.
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