MANFRED KAGE / SCIENCE PHOTO LIBRARY MANFRED KAGE / SCIENCE PHOTO LIBRARY
Light micrograph of a section through the skin of a human scalp. The pale sac-like structures associated with the long hair follicles of the scalp are sebacaous glands. They produce sebum, an oily substance which waterproofs skin and hair. At the bottom of this photograph can be seen a mass of tubules cut in various planes; this is a sweat gland, forming a compact tubular coil deep in the dermis. It straightens out into a long duct which rises through the epidermis to the skin surface (top). The secretion of sweat, mostly sodium chloride and urea, occurs through this duct. Magnification: x30 at 6x7cm size.
Model release not required. Property release not required.