The dermis can be divided into papillary and reticular layers, located between the epidermis and subcutaneous tissue, mainly composed of connective tissue such as collagen fibers, elastic fibers, reticular fibers and amorphous matrix, among them there are nerve and nerve endings, blood vessels, lymph Tube, muscle and skin appendages.
The skin contains a large number of sensory nerve ending. These nerve endings are the terminal part of the protrusion around sensory neurons (pseudopolar neurons), which together with other structures make up the receptors.
Girls should make up, nails. However, the University of Washington researchers found that this beauty is a price, cosmetics, skin care products in some of the chemical composition will disrupt the natural secretion of human hormones, leading to menopause up to 4 years in advance.