PHILIPPE PLAILLY / SCIENCE PHOTO LIBRARY PHILIPPE PLAILLY / SCIENCE PHOTO LIBRARY
Illustration showing a cross-section through human skin. The outer layer (top, shaded area) is the epidermis, a protective layer of flattened, horny cells impregnated with keratin. Underneath the epidermis is the dermis (a thick layer of connective tissue) & a layer of subcutaneous fat. A number of structures arise within the dermis: at right is a hair follicle (black & blue) with a sebaceous gland (dark red) attached to its right side. At far left (in blue) is an eccrine sweat gland, which penetrates the epidermis to reach the skin surface.
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