anatomical system integumental system dermal system integumentary system integumentum commune organ system that protects the body from damage, comprising the skin and its adnexa (including hair, scales, and nails). The integumentary system has a variety of functions; it may serve to waterproof, cushion and protect the deeper tissues, excrete wastes, regulate temperature and is the location of receptors for pain, sensation, pressure and temperature. In humans the integumentary system additionally provides vitamin D synthesis[WP].