Dermis and Hypodermis The dermis is the connective tissue that contains collagen and elastic fibers, fibroblasts and most of the accessory structures of the skin, including hair follicles and cutaneous glands. The dermal papillae are upward extensions of the dermis into the epidermis forming the ridges of the fingerprints. The hypodermis is also known as subcutaneous tissue or superficial fascia. It contains a greater proportion of adipose tissue than the dermis and therefore serves as an energy reservoir and aids in thermoregulation by providing insulation. Accessory Organs of the Skin Pigmentation Skin color is a combination of several proteins and pigments. We have already discussed melanin, which varies in coloration from yellow or red to deeper brown and black. The amount of melanin synthesis increases in response to UV radiation, which accounts for the deepening color of the skin when exposed to sunlight. Hemoglobin is the protein that gives our blood its red color. This coloration can be seen through the layers of the skin and thus contributes to overall
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