Skin and Its Appendages. melanocyte L/M: lies between basal cells, with thin and long processes which present amongst with thin and long.

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Presentation transcript:

Skin and Its Appendages

melanocyte L/M: lies between basal cells, with thin and long processes which present amongst with thin and long processes which present amongst the cells of the stratum basale and stratum spinosum. the cells of the stratum basale and stratum spinosum. E/M ：① abundant in ribosomes,RER and Golgi complex; ② with membrane bound melanosomes. ② with membrane bound melanosomes. Function ： protection from the hurt by UV light.

Melanocyte

Melanin granules

Langerhans cell

2.1 papillary layer Connective tissue. Abundant in capillaries, free Connective tissue. Abundant in capillaries, free nerve endings and tactile corpuscles. nerve endings and tactile corpuscles. 2.2 reticular layer dense connective tissues, consisting of bundles dense connective tissues, consisting of bundles of collagen fibers, numerous elastic fibers, etc. of collagen fibers, numerous elastic fibers, etc. containing blood vessels, nerve fibers,lamellar containing blood vessels, nerve fibers,lamellar corpuscles, sweat glands,etc. 。 corpuscles, sweat glands,etc. 。

tactile corpuscle

Lamellar corpuscle

appendages of skin

hair shaft hair root hair bulb

sebaceous gland

Sweat gland

Key points 1) composition of the skin:epidermis,dermis and its appendages. appendages. 2) 5 layers of the epidermis, the epidermis: keratinocyte and unkeratinocyte. keratinocyte and unkeratinocyte. 3) 3 types of the unkeratinocyte and their functions. 4) 2 kinds of sweat glands and their secretions.