Ear, Human, Tympanic membrane
The thin, semitransparent tympanic membrane, or eardrum, which forms the boundary between the outer and middle ear, is stretched obliquely across the end of the external canal. Its diameter is about 9 millimetres (0.35 inch), its shape that of a flattened cone with its apex directed inward. Thus, its outer surface is slightly concave. The edge of the membrane is thickened and
posted by TiredKnife @ 5:49 AM
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