1. Integumentary System Skin function Skin (cutaneous membrane)
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Skin (cutaneous membrane)
Skin function

2. Skin Structure – 2 main layers
Epidermis – outer layer
Stratified squamous epithelium
5 layers
Avascular
Dermis
2 layers thick
Dense irregular connective tissue and areolar
Figure 4.3

3. Skin Structure
Deep to dermis is the hypodermis

4. Skin of Woman

5. Layers of Epidermis (5) Deep to superficial: Stratum basale
Stratum spinosum
Stratum granulosum
Stratum lucidum
Stratum corneum
(outermost)
(20 – 30 cells thick)

6. Layers of the Epidermis

7. 1. Stratum Basale (Basal Layer)
youngest keratinocytes
“germinativum”

8. 2. Stratum Spinosum (Prickly Layer)
Several layers thick
Pre-keratin filaments are present

9. LaCrosse, WI !

10. *Layers of the Epidermis: Stratum Granulosum (Granular Layer)
Granules for waterproofing ability
Increasing keratin
Flattened

11. 3. Stratum Lucidum (Clear Layer)
Few layers
Present only in thick, hairless skin

12. 5. Stratum Corneum (Corny Layer)
20-30 layers
Completely keratinized

13. Label Me:

14. Dermis (“Hide” – leather)
Two layers
1. Papillary layer
(Meissner’s corpuscle)
Capillary loops
Dermal papillae
2. Reticular layer
Pacinian corpuscles

15. SKIN OF THE FINGER
1 – stratum basale layer of epidermis 2 - stratum spinosum of epidermis 3 – stratum granulosum of epidermis 4 – stratum lucidum layer of epidermis 5 – stratum corneum layer of epidermis 6 - papillary layer of dermis 7 - reticular layer of dermis

16. 5 layers of the epidermis: Dermal layers:

17. Mnemonic device
ROY G BIV
7 layers
Deep to superficial

18. Appendages of the Skin Sebaceous glands Suderiferous glands Sebum
Eccrine
Apocrine –
Axillary (?) and genital areas

19. Sweat and Its Function
Composition –
Function
B.O.!

20. Appendages of the Skin Hair Melanocytes Arrector pili Sebaceous gland
Sweat gland
Figure 4.7c

22. Appendages of the Skin
Nails
Free edge
Body
Root of nail

23. Label Skin Diagram

25. Skin Homeostatic Imbalances
Infections:
Athletes foot
Boils and carbuncles
Cold sores (fever blister)

26. Skin Homeostatic Imbalances
Infections and allergies
Contact dermatitis
Impetigo
Psoriasis

27. Frostbite (stages of frostbite)

28. Skin Homeostatic Imbalances
Burns
Associated dangers:
Rule of Nines

29. Severity of Burns
First-degree Second degree Third-degree

30. Click on me!

31. Critical Burns
Burns are considered critical if:
Facial burns/joints

32. Normal Skin Color Determinants (3 factors)
Melanin
Carotene
Hemoglobin
Cyanosis (poor oxygen)

33. Melanin
melanocytes

34. What happens to skin with too much sun?

35. Skin Cancer (BBC) Skin cancer is the most common type of cancer
Two types
Benign
Malignant
Skin cancer is the most common type of cancer

36. Skin Cancer Types (3 major types)
1. Basal cell carcinoma
2. Squamous cell carcinoma

37. Skin Cancer Types
3. Malignant melanoma

38. ABCD Rule A = Asymmetry B = Border irregularity C = Color D = Diameter
Two sides of pigmented mole do not match
B = Border irregularity
Borders of mole are not smooth
C = Color
Different colors in pigmented area
D = Diameter
Spot is larger then 6 mm in diameter

40. What happens to skin as we age?