Sensory nerves and motor nerves are distributed in the skin. Their nerve endings and special receptors are widely distributed in the epidermis, dermis and subcutaneous tissue to sense various senses such as touch, cold, warm, pain, pressure, itch, etc., cause corresponding nerve reflex, and maintain the health of the body. The sensation of skin can be divided into two categories: one is a single sensation. The various sensory nerve endings in the skin convert different stimuli into nerve action potentials with a certain time and space, and transmit them to the central nervous system along the corresponding nerve fibers to produce differences
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