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Skin and Its Appendages. melanocyte. L/M: lies between basal cells, with thin and long processes which present amongst the cells of the stratum basale and stratum spinosum. E/M : ① abundant in ribosomes,RER and Golgi complex; ② with membrane bound melanosomes.
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melanocyte L/M: lies between basal cells, with thin and long processes which present amongst the cells of the stratum basale and stratum spinosum. E/M:① abundant in ribosomes,RER and Golgi complex; ② with membrane bound melanosomes. Function:protection from the hurt by UV light.
2.1 papillary layer Connective tissue. Abundant in capillaries, free nerve endings and tactile corpuscles. 2.2reticular layer dense connective tissues, consisting of bundles of collagen fibers, numerous elastic fibers, etc. containing blood vessels, nerve fibers ,lamellar corpuscles, sweat glands ,etc. 。
Key points 1) composition of the skin:epidermis,dermis and its appendages. 2) 5 layers of the epidermis, the epidermis: keratinocyte and unkeratinocyte. 3) 3 types of the unkeratinocyte and their functions. 4) 2 kinds of sweat glands and their secretions.