1. Integumentary System

2. Epidermis Outer layer of skin Stratified squamous Has no blood supply
Cells go through process of keratinization
Regular skin has four strata
Thick skin has five strata

3. Stratum basale Next to basement membrane and blood supply
Active mitosis
Contain melanocytes

4. Stratum spinosum Consists of several layers
Spiny projections extend down to connect layers together

5. Stratum germinativum Composed of two layers: Stratum basale
Stratum spinosum

6. Stratum granulosum 2-3 layers of flattened cells
Keratinization begins here

7. Stratum Lucidum
Translucent 2-3 layers
Only found in thick skin

8. Stratum corneum Outermost layer ¾ of thickness 20-30 layers
Cells are completely keratinized
5 week life cycle

9. Dermis

10. Dermis Stratum corium Made of dense connective tissue Papillary layer
Reticular layer

11. Subcutaneous layer Anchors skin Loose connective and adipose tissues
Also called hypodermis or superficial fascia

12. Skin Color

13. Functions Protection Sensory reception Regulation of body temperature
Synthesis of vitamin D

14. Epidermal Derivatives
Hair and hair follicles
Nails
Glands

15. Hair and hair follicles
Composed of dead, keratinized cells
Produced from stratum basale
Color determined by melanin production
Texture determined by shape of hair shaft

16. Nails
Layers of dead stratum corneum
Stratum basale forms nail bed

17. Glands
Three types:
Sebaceous
Sudoriferous
Ceruminous

18. Sebaceous glands Found everywhere there is hair Holocrine glands
Secrete sebum
Keeps skin and hair pliable
Inhibits bacterial growth and helps prevent water loss
Activated by increased sex hormones

19. Sudoriferous glands Sweat glands
Located everywhere except the lips, nipples, and parts of the external genitalia
Merocrine and apocrine glands

20. Ceruminous glands Modified sweat glands in the ear canal
Secrete cerumen

21. ABCD Rule for Moles

22. Burns
First degree
Second degree
Third degree
Rule of nines

23. First degree burn

24. Second degree burn

25. Third degree burn