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Touch sensor. Light micrograph of sectioned Pacinian corpuscle (large circle, centre), a sensory receptor for touch. The corpuscle consists of nerve endings surrounded by 'onion-skin' membrane layers. The nerve cells are stimulated when the membranes are deformed by changes in pressure. Pacinian corpuscles are especially sensitive to vibration. They are found in skin & some internal membranes. Magnification unknown.
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