Hair follicles, sebaceous glands and sweat glands pass to the epidermis through this layer. In the earliest days of fetal life, the epidermis is a single sheet of cells, which becomes a double layer between the 5th and 7th week. After the 12th week it grows to attain the adult epithelial structures . As age advances, the number of elastic fibres in the dermis reduces thereby skin becomes old and loses is elasticity. This appears externally as wrinkles and loss of skin tone.
Hair is present on all parts of the body except the palms, soles and the red portion of the lips.
The pattern of hair distribution, its density and longevity depend on a person's hereditary influences, nutrition and medical status. Soft, long hair occur on the scalp, beard, axilae and pubis. Stiff hair or bristles are found in eyelashes, eyebrows and inside the nose. On the rest of the body, downy unpigmented hair is found. Nails are convex, translucent horny plates situated at the tips of our fingers and toes.