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Epidermis is an enveloping layer of skin of the person which is to epithelium derivatives. In thick, not covered with hair, skin it consists of five layers which are located over a derma. The main function of epidermis – barrier.
Updating of epidermis happens constantly. The ability given it is connected with special transformations and movements of keratinotsit to periblasts from deep during their differentiation. When flaking scales there is a removal of biological and chemical pathogens. Besides, epidermis contains immunity components.
Keratinotsit - it is a cell of epithelial fabric which is provided by a keratin – protein which has high mechanical durability. Layers of epidermis consist, generally of cells of this type.
The structure of epidermis represents the difficult structure consisting of five layers which are located one after another from a derma to a skin surface.
The deepest layer of epidermis – basal. Further for them there is an acanthceous layer, and because of poliferativny activity of two these layers they are integrated in one – a rostkovy layer of Malpigi. Both these layers can replace each other in case of need: normal regeneration of epidermis happens at the expense of a basal layer, but in case of its damage also the acanthceous layer can undertake this function. The basal layer of epidermis is provided by kertinotsita, organellas, granules with melanin, T lymphocytes and other cells. The acanthceous layer also consists of keratinotsit. Its main objective – protection of a cellular kernel against damages.
The granular layer of epidermis is located above to a skin surface, than two previous layers. Its main objective – protection of inside layers of skin against hit of water in basal and acanthceous layers. Besides, the subsequent keratinization of an epithelium begins here.
The brilliant layer is the following layer of epidermis. Under a microscope it looks as a strip of pinkish color which cells do not come to light.
The corneous layer is the main blanket which is not incorporating living cells. It is formed of horn scales which connected definitely. Thickness of this layer is individual: it depends on localization, intensity of mechanical loadings and some other factors. Is normal horn of a layer is protection against a set of pathogens.