1. Skin and Its Appendages

2. 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.

3. Melanocyte

4. Melanin granules

5. Langerhans cell

6. Langerhans cell

8. 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. 。

9. tactile corpuscle

10. Lamellar corpuscle

11. Lamellar corpuscle

12. appendages of skin

13. hair shaft hair root hair bulb

15. sebaceous gland

16. sebaceous gland

17. Sweat gland

18. 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.