Ear, external means: External ear: The ear has three parts. These are the outer ear and middle ear as well as the inner. Although it looks complex, the external ear is the most functionally simple part of the ear. The external ear is composed of the pinna, or the auricle, which is the projecting part of the ear. It also includes the external audio meatus, which is the exterior opening to the ear canal. The pinna and the meatus are the three main components. Only the external ear has one function: to focus air vibrations on the eardrum and make it vibrate. Also known as the outer ear, is the external ear.
(in Medical Dictionary)