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Walk the Even Hospital Database by book and chapter — the raw source passages that ground Ask, DDx, and the rest.

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introductionstatpearls· Introduction· item NBK470359

The external ear is the visible part of the hearing apparatus. It is comprised of the auricle (pinna) and external auditory canal, including the lateral surface of the tympanic membrane. Together with the tympanic membrane and the middle ear, the pinna serves to amplify sound. The pinna acts as a funnel to deliver sound to the external acoustic meatus, and the external auditory canal concentrates sound onto the tympanic membrane for further transmission.[1][2][3]