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Skin and Its Appendages
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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.
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Melanocyte
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Melanin granules
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Langerhans cell
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Langerhans cell
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2.1 papillary layer 2.2 reticular layer
Connective tissue. Abundant in capillaries, free nerve endings and tactile corpuscles. 2.2 reticular layer dense connective tissues, consisting of bundles of collagen fibers, numerous elastic fibers, etc. containing blood vessels, nerve fibers ,lamellar corpuscles, sweat glands ,etc. 。
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tactile corpuscle
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Lamellar corpuscle
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Lamellar corpuscle
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appendages of skin
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hair shaft hair root hair bulb
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sebaceous gland
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sebaceous gland
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Sweat gland
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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.
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