This cadaveric specimen of this left tympanic membrane has been stained with osmium which shows thickened patches of keratin as the surface of the epithelium migrating centrifugally.
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![Normal Epithelial Migration of the Tympanic Membrane and External Auditory Canal [osmium stain]](https://medtube.net/images/min/7af5925e92646a7a4ceb9bcf485e1248/149/112/1 "Normal Epithelial Migration of the Tympanic Membrane and External Auditory Canal [osmium stain]")