Frog tympanum surface, SEM

Frog tympanum surface, SEM

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Credit: DENNIS KUNKEL MICROSCOPY/SCIENCE PHOTO LIBRARY

Caption: scanning electron micrograph (SEM) Frog tympanic membrane surface (Eleutherodactylus coqui). Shown here is the surface of the frog tympanic membrane (ear membrane). Individual epithelial cells (skin cells) with highly convoluted surface ridges make up the tympanic membrane surface. In frogs a distinct tympanic fold wraps around the tympanum. The tympanum is composed of nonglandular skin cells (epithelial cells) and unlike the human eardrum it is situated externally on the frog (in most species behind the eye). It functions in a similar fashion to the human eardrum. There is a bone attached to the tympanic membrane that also attaches to the oval window of the inner ear. When sound waves strike the membrane vibrations are transferred via this bone to the fluid of the inner ear. This in turn causes receptors within the inner ear to be stimulated, sending a transmission to the brain for processing. Magnification: x12 when shortest axis printed

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