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Friday, May 6, 2011

FUNCTIONS OF EPIDERMIS AND CORIUM - LESSON 243

In this post we will learn the functions of epidermis and about Dermis or Corium.
In the last lesson we have learnt upto Melanocytes. Melanocytes form and consist of a black pigment called melanin that is transferred to other epidermal cells and gives color to the skin. In several races, the amount of melanin accounts for the color differences, but the number of melanocytes in all races is same. Individuals who possess darker skin contain more melanin within the melanocytes, not a larger number of melanocytes. For protection against the harmful effects of ultraviolet radiation, the presence of melanin in the epidermis is vital, which can manifest themselves as skin cancer. The persons or individuals who, through a flaw in their chemical makeup are incapable of forming melanin at all which are called albino (means white). Those persons will get skin and hair white. Their eyes because in the absence of pigment, the tiny blood vessels are visible in the iris (normally pigmented portion) of the eye.

The production of melanin increases with exposure to strong ultraviolet light, and this creates a suntan, which is a protective response. The skin becomes sunburned and inflamed (redness, swelling, and pain) when the melanin cannot absorb all the ultraviolet rays. Over a period of years, excessive or more exposure to sun can tend to cause wrinkles and cancer of the skin. Darker people (with dark skin) get less likely to develop skin cancer because the dark-skinned people have more melanin and also they have fewer wrinkles.

Corium (Dermis):-
The corium is also called dermis is a layer, directly below the epidermis. It is composed of blood and lymph vessels and nerve fibres, as well as the accessory organs of the skin, which are the hair follicles, sweat glands, and sebaceous glands. The supposition of the elaborate system of nerves, vessels, and glands, the corium contains connective tissue cells and fibers that account for the extensibility and elasticity of the skin.

In the next post we will learn about the remaining part of the dermis.

OK………..

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