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Scratching hand zoom Illustration and Icon
Scratching hand zoom
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A simplified illustration shows one human hand using the fingernails to scratch the dorsal skin of the opposite hand. The hand, an anatomical structure of Homo sapiens (human), acts on skin tissue (epidermis and dermis) within the integumentary system, situated on the dorsal region of the upper limb. In dermatology and physiology, scratching mechanically stimulates cutaneous receptors and activates afferent fibers in the PNS (peripheral nervous system) to relieve pruritus, though repeated abrasion can cause excoriation.
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