这个词是什么意思？
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.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D014432 · MeSH 2026。
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