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SUB TOPIC 6: THE SKIN
The skin is the outer covering of the body. It covers the entire body surface and it is thickly covered with hair in most mammals but in man, it is sparsely covered except the head where the hair is thick and long
Structure of the skin
The skin is made up of two main layers:
THE EPIDERMIS
The epidermis is made up of three layers, namely:
Skin Cancer
The dark patch on this person’s lower leg is a dangerous form of skin cancer known as malignant melanoma. Overexposure to ultraviolet radiation in sunlight is the cause of most skin cancers.
THE DERMIS
The dermis is thicker than the epidermis. It is made up of connective tissues. Most of the special structures of the skin including blood capillaries, hair follicles, sweat gland sensory nerve ending, sebaceous glands and fat cells are located here.
Blood capillaries supply the dermis and lower epidermis with nutrient and oxygen. They also remove wastes. They form a network around the root of the hair follicles and sweat glands.
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