The pinna is the visible, bumpy portion of the ear that is useful for helping to locate sounds.
The pinna, or outer ear, is formed of ridged cartilage that is covered with skin.
What is the purpose of external ears?
The pinna, concha, and auditory meatus, which make up the external ear, collect sound energy and direct it toward the eardrum, also known as the tympanic membrane. One effect of the external ear's design is that it increases the sound pressure by 30 to 100 times for frequencies around 3 kHz.
The external auditory canal and the pinna, which can be seen on the side of the head, make up the outer ear (ear canal). The pinna's function is to collect sound waves, slightly amplify them, and direct them toward the tympanic membrane through the ear canal (eardrum).
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