1. The Integumentary System
Chapter 5

2. Integumentary Structure and Function
The Integumentary system, or integument, consists of the cutaneous membrane which includes:
Epidermis
Dermis
Accessory Structures
Hypodermis
Functions of the integument
Protection
Temperature maintenance
Synthesis and storage of nutrients
Sensory reception
Excretion and secretion

4. The Epidermis Comprised of thin and thick skin Layers of the Epidermis
Thin- Covers most of the body
Thick-Found on the palms of the hands and soles of the feet
Layers of the Epidermis
Stratum germinativum, stratum spinosum, startum granulosum, stratum lucidum, and stratum corneum
As cells age, they move from the stratum germinativum to the stratum corneum

5. The stratum germinative form epidermal ridges which interlock with the dermal papillae of the dermis
Together, they form superficial ridges on the palms and soles. This allows us of our griping ability. (FINGERPRINTS!)
As superficial layers are lost, new layers arrive the underlying strata.

6. Layers of the Epidermis

7. Skin Color
The color of your skin is caused by the interaction between two factors:
Blood Supply
Pigment concentration and composition
Pigmentation of the skin
Carotene- orange-yellow pigment found in epidermal cells
Melanin- brown, yellow-brown or black
Melonocytes protect the cells from UV radiation, melanin absorbs UV before it reaches the deep layers

8. Too much UV radiation causes CANCER!
Small amounts of UV radiation is beneficial, helps epidermal cells synthesize vitamin D₃.
Too much UV radiation causes CANCER!
Skin cancers are the most common form of cancer
Basal and squamous cell carcinomas are not as dangerous as melanoma.
Wear SPF!!