part_of part of has part anatomical system multicellular organism integumental system Connected anatomical system that forms a barrier between an animal and its environment. In vertebrates, the integumental system consists of the epidermis, dermis plus associated glands and adnexa such as hair and scales. In invertebrates, the integumental system may include cuticle. body surface dermal system external covering of organism integumentary system integumentum commune organism surface surface outer epithelium