1. Skin and Its Appendages

10. 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.

12. Melanocyte

13. Melanin granules

15. Langerhans cell

20. 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. 。

21. tactile corpuscle

22. Lamellar corpuscle

27. appendages of skin

29. hair shaft hair root hair bulb

32. sebaceous gland

35. Sweat gland

36. 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.