The document summarizes the key structures and functions of the integumentary system in 3 paragraphs or less: The integumentary system includes the skin, hair, and nails. The skin is the largest organ and protects the body from damage, regulates temperature, and detects sensations. It is composed of three layers - the epidermis, dermis, and hypodermis. The epidermis contains keratinocytes and other cell types and becomes keratinized to form a protective barrier. Hair grows from follicles in the dermis and comes in different types. Glands in the skin including sweat glands help regulate temperature and sebaceous glands produce oil to moisturize the skin.

3. Structure of the Skin

6. Cell and Layers of the Epidermis

13. Epidermal Layers and Keratinization

22. Cutaneous Glands

30. Structure of Hair Follicle

31. Eumelanin Pheomelanin and little eumelanin Pheomelanin and little eumelanin Red Hair Blonde Hair Brown/Black hair

32. Hair Color and Texture, Gray and White White hair = air in medulla and lack of pigment in cortex. Gray hair is a mixture of white and pigmented hairs. And frequently a sign of great wisdom!! :)

35. Fingernail Structure

45. Rule of Nines Figure 5.8a