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  Skin

Skin:

Skin is the main organ of the body forming 8 percent of its net mass and having area between 1.1 to 2.2m2. It is the main interface among the body and the atmosphere and covers the whole surface. It is continuous with mucosae at different orifices and with lining tissue of organs such as eyes and ears.

Different structures involving sweat glands, sebaceous glands, hair follicles and nails are formed by changes of epidermis. The sebaceous glands secrete an oily substance termed as sebum and open on the sides of the hair follicles. Sweat glands are of two kinds, Merocrine and Apocrine. The Merocrine glands are found all through the body opening on the surface and secreting a clear watery fluid. Apocrine glands are found in the areas such as axilla, pubis, areola, scrotum and perianal areas. Their ducts might open on the surface or into the hair follicle.

Dermis is made of connective tissue having matrix in which it is embedded with elastic and collagen fibers to give strength and elasticity. It also gives a compartment for blood vessels, lymphatics, nerves and cells related with immunity. Receptors for the sensations like pain, touch, warmth, pressure, cold and vibration senses are too found in the skin.

Circulation via skin serves two main functions nutrition and conduction of heat to the atmosphere.

 

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