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Thursday, April 21, 2011

Skin Structure and the Epidermis – Lesson 242

In the last lesson, we have learnt about the function of the skin. In this lesson, we are going to learn about the anatomy and physiology of the skin. Skin consists of three layears from the external surace of the body. The names of these three layers are epidermis, corium, and subcutaneous. In these three layers, the first and foremost outer layer epidermis is a thin cellular membrane, but the other middle layer called corium or dermis is fibrous and dense layer that is made up of connective layer, and the innermost layer of the skin is called subcutaneous, which is thicker than the other two layers and is made up of fat tissue. In this post, we will learn specifically about the outermost layer epidermis. Okay.

Human skin contains nine parts generally. They are

1. Epidermis layer
2. Corium layer or dermis layer
3. Subcutaneous layer
4. Blood vessels
5. Lymph vessels
6. Nerve fibers
7. Hair follicle
8. Sebaceous glands
9. Sweat glands

Skin - Epidermis layer:

This is the outermost layer of the skin, which is made up of a cellular layer externally on the skin. This layer is made up of an epithelium called squamous epithelium. In actual sense, outer skin of the body is wrapped by epithelium. These epithelial cells are normally scaly in nature and flat in shape. These squamous epithelial cells in the external layer of the skin put together in quite a lot of coatings called strata.

As we already know, this layer is deficient of blood or lymphatic vessel contact as in other two layers, but it gets the oxygen and other nourishments from the next layer of the skin called corium through tissue solution. The deepest layer of the epidermis layer is called basal layer and the superficial layer is called stratum corneum and is made up of a protein called keratin. The basal layer is made up of a special kind of cells called melanocytes. We will see the functions of the epidermis in the next post. Okay.

Come on.

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