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# Long description

A vertical cross-section of the skin of a typical mammal. The upper (outer) epidermis consists of tough, dead cells. The inner dermis is a much thicker layer and contains glands and nerve endings that impart sensitivity to touch. The hairs that protrude from the surface of the skin have their roots deep in the inner dermis. One of these surface hairs is shown in cross-section. There is an erector muscle attached to it, a sebaceous gland that is wrapped around the hair and a blood supply at the base. The inner dermis also contains sweat glands.