1. Anatomy chp 6 cont
Hair and nails

2. Hair: Guards the head-from sunburn and injury from a glancing blow
Protects the eye
Keeps foreign materials out of the airways

3. Hair structure: Follicle-epithelial cells
Root-enclosed by the follicle
Shaft-projects from the skin
Matrix-growth zone in the follicle
Arrector pilli-muscle for hair movement

4. Structure of a hair: Medulla-inner layer Cortex-middle layer
Cuticle-outer layer

5. Nails:
Modified epidermis

6. Nail structures: Free edge Body Root Cuticle-thick proximal nail fold
Nail matrix-growth zone of the nail
Lunula-white crescent area of nail

7. Skin infections and allergies:
Athlete’s foot-fungal infections
Boils-inflamed hair follicle
Cold sore-fluid filled blister form herpes virus or stress
Impetigo-very contagious staphylococcus bacteria; reddish pink lesions around mouth and nose

8. Burns:
May kill due to
High fluid loss
Infection

9. Degrees of burns:
1st degree-epidermis is damaged-sunburn, stove or oil; regeneration will occur-painful
2nd degree-epidermis and upper regions of dermis is damaged-skin blisters; regeneration will occur-very painful
3rd degree-destroys entire thickness of the skin, nerve endings are destroyed so the burn area is not painful; no regrowth or regeneration-must have skin graff

10. Cancer:
Own cells growing uncontrollable-forms a mass that can shut systems down??????

11. Skin cancer:
Cancer gene is thought to be turned on by ultra violet light-radiation or some unknown reason???????????

12. Cancer terms: Benign tumor-non cancerous Malignant tumor-cancerous
Carcinoma-slow growing cell mutation
Melanoma-spreading brown or black patch from moles

13. ABCD rules for moles: A-Asymmetry-matching sides
B-Border-irregularity-not having smooth borders
C-Color-many pigments-brown, black and red
D-Diameter-increasing in size or height-anything larger than 6mm(pencil eraser) should be checked