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

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

Appendages of the Skin Hair Melanocytes Figure 4.7c

Associated Hair Structures Arrector pili Sebaceous gland Sweat gland Figure 4.7a

Appendages of the Skin Nails Free edge Body Root of nail

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

Skin Homeostatic Imbalances Infections and allergies Contact dermatitis Impetigo Psoriasis

Skin Homeostatic Imbalances Burns Associated dangers:

Frostbite (stages of frostbite)

Rule of Nines Way to determine the extent of burns Figure 4.11a

Severity of Burns First-degree Second degree Third-degree

Click on me!

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

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

Melanin melanocytes

What happens to skin with too much sun?

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

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

Skin Cancer Types 3. Malignant melanoma

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

What happens to skin as we age?