1. The Integumentary System Chapter 5

2. Introduction The integumentary system consists of hair, skin, and nails. The integumentary system consists of hair, skin, and nails. Skin accounts for approximately 7% of total body weight (9-11 lbs) and varies in thickness (1.5 mm to 4.0 mm). Skin accounts for approximately 7% of total body weight (9-11 lbs) and varies in thickness (1.5 mm to 4.0 mm). Skin is composed of two distinct regions. Skin is composed of two distinct regions.

3. LAYERS OF SKIN

4. SKIN FUNCTIONS Protection Protection Body temperature regulation Body temperature regulation Cutaneous sensation Cutaneous sensation Metabolic functions Metabolic functions Blood reservoir Blood reservoir Excretion of wastes Excretion of wastes

5. EPIDERMIS Cell Types Cell Types Keratinocytes Keratinocytes Melanocytes Melanocytes Langerhans’ cells Langerhans’ cells Merkel cells Merkel cells

6. EPIDERMIS Layers Layers Stratum basale Stratum basale Stratum spinosum Stratum spinosum Stratum granulosum Stratum granulosum Stratum lucidum Stratum lucidum Stratum corneum Stratum corneum

7. DERMIS Underlies the epidermis Underlies the epidermis Composed of two layers Composed of two layers Papillary layer= areolar loose connective tissue Papillary layer= areolar loose connective tissue Reticular layer= dense irregular connective tissue (80%) Reticular layer= dense irregular connective tissue (80%) Contains many nerve endings Contains many nerve endings

8. DERMIS

9. Review Question What is the name of the inner-most layer of the epidermis? a. Hypodermis b. Stratum basale c. Stratum corneum d. Dermis e. Stratum lucidum

10. Review Question Which layer of the dermis contains dense regular connective tissue? a. Hypodermis b. Papillary layer c. Reticular layer d. Stratum spinosum e. Stratum granulosum

11. SKIN PIGMENTATION Melanin Melanin Carotene Carotene Hemoglobin Hemoglobin

12. ACCESSORY OGRANS Sweat glands Sweat glands Eccrine Eccrine Apocrine Apocrine Ceruminous Ceruminous Mammary Mammary Sebaceous glands Sebaceous glands

13. ACCESSORY ORGANS

15. Review Question Which of the following refers to a modified sweat gland found in the external auditory meatus where it produces wax? a. Apocrine gland b. Eccrine gland c. Sebaceous gland d. Ceruminous gland e. Mammary gland

16. Review Question Which of the following terms refers to the cuticle of the nail? a. Eponychium b. Hyponychium c. Lunula d. Matrix e. Root

17. SKIN DISORDERS Skin cancer Skin cancer

18. SKIN CANCERS Skin Cancer Video

19. SKIN DISORDERS Skin cancer Skin cancer Burns Burns

20. SKIN DISORDERS

21. Rule of Nines

22. SKIN DISORDERS Skin cancer Skin cancer Burns Burns Rosacea Rosacea

23. ROSACEA

24. SKIN DISORDERS Skin cancer Skin cancer Burns Burns Rosacea Rosacea Dermatitis Dermatitis Contact dermatitis Contact dermatitis Acne Acne Jaundice Jaundice Seborrhea Seborrhea Hirsutism Hirsutism Alopecia Alopecia Impetigo Impetigo Psoriasis Psoriasis Albinism Albinism Striae Striae