The projected, curved parts of the outer ear that contour the frequency response and phase characteristics of the sounds going to the inner ear, allowing the brain to determine from which direction they emanate.
The outer ear, which is composed of skin and cartilage. The pinna focuses sound waves into the middle and inner ears. Having two pinnae helps animals determine the location of a sound. In some animals, the pinna serves additional functions, such as heat dissipation.
Any species of Pinna, a genus of large bivalve mollusks found in all warm seas. The byssus consists of a large number of long, silky fibers, which have been used in manufacturing woven fabrics, as a curiosity.