Skin And Some Of Its Specialized Structures


Skin And Some Of Its Specialized Structures


The skin, the body’s largest organ, consists of the epidermis, a superficial cellular layer, and the dermis, a deep connective tissue layer

Skin And Some Of Its Specialized Structures

Skin And Some Of Its Specialized Structures

The epidermis is a keratinized epithelium —that is, it has a tough, horny superficial layer that provides a protective outer surface overlying its regenerative and pigmented deep or basal layer . The epidermis has no blood vessels or lymphatics. The avascular epidermis is nourished by the underlying vascularized dermis . The dermis is supplied by arteries that enter its deep surface to form a cutaneous plexus of anastomosing arteries. The skin is also supplied with afferent nerve endings that are sensitive to touch, irritation (pain), and temperature. Most nerve terminals are in the dermis, but a few penetrate the epidermis.

The dermis is a dense layer of interlacing collagen and elastic fibers . These fibers provide skin tone and account for the strength and toughness of skin. The dermis of animals is removed and tanned to produce leather. Although the bundles of collagen fibers in the dermis run in all directions to produce a tough felt-like tissue, in any specific location most fibers run in the same direction. The predominant pattern of collagen fibers determines the characteristic tension and wrinkle lines in the skin.

Source: Clinically Oriented Anatomy

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