Anatomy and Physiology of the Integumentary System. Definition: Integument [L. integumentum, a covering]. A covering consisting of the corium or dermis, and epidermis. The integumentary system includes the skin and its appendages, including the hair and nails.
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Anatomy and Physiology of the Integumentary System Definition: Integument[L.integumentum, a covering]. A covering consisting of the corium or dermis, and epidermis. The integumentary system includes the skin and its appendages, including the hair and nails. Tabers Cyclopedic Medical Dictionary 14th edition
Epidermal-dermal junction: also known as the basement membrane. At this junction there is an exchange of cells and fluid between the dermis and epidermis. The epidermis normally does not contain blood vessels or nerves. The skin usually ranges from 1 1/2 to 4 mm. thick and the epidermis makes up about 1/10 of a millimeter. However the keratin layer can increase to about 1 mm on the palms and soles. The epidermis and dermis are bound together by a series of projections that grow up (dermal papillae) and down (rete ridges), which interface with each other.
Dermis: There are two layers - the papillary and reticular layers. The dermis underlies the epidermis and consists of a mucopolysaccharide matrix in which collagenic and reticular fibers are found. The dermis contains the blood vessels and nerves as well as the nutrient supply to the deeper living layers of the epidermis. The blood vessels here play an important role in the regulation of body temperature. The nerve fibers are scattered throughout the dermis. Some of them (motor fibers) carry impulses to dermal muscles and glands, causing these structures to react. Others (sensory fibers) carry impulses away from specialized sensory receptors located within the dermis. One set of dermal receptors (Pacinian corpuscles) is stimulated by heavy pressure, while another set (Meissner’s corpuscles) is sensitive to light touch. Still other receptors are stimulated by temperature changes or factors that can damage tissues.