Tympanic Membrane

**Definition:** An oval semitransparent membrane separating the external EAR CANAL from the tympanic cavity (EAR, MIDDLE). It contains three layers: the skin of the external ear canal; the core of radially and circularly arranged collagen fibers; and the MUCOSA of the middle ear.

**Tree numbers:** - A09.246.272.702

**Synonyms:** - Eardrum