The document describes the integumentary system and its structures. It provides a learning outcome for identifying and describing key skin structures like the dermis, epidermis, hypodermis, hair root, hair shaft, hair follicle, sweat glands, and sebaceous glands. The document compares and contrasts thick and thin skin. It also labels and describes structures of the nail including the free edge, lunula, nail body, nail groove, eponychium, nail root, nail bed, hyponychium, and nail fold.