Reticular Derm

The reticular Derm , difficult to differentiate from the deep Derm, is denser (because of presence of fibers of Collagène S) and rubber bands. It is lower in cells.

The reticular derm is braided with the major part of the papillary Derme and also contains Fibronectine, fibers reticulinic, Fibrocyte S, Histiocyte S and intercellular liquid.

The reticular derm contains:

of fibers of élaunine, intermediary enters the fibers oxytalanes and rubber bands.
of fine collagen fibers. Collagen is composed of 19 amino-acids present in variable proportion (especially glycine, arginine, hydroxyproline, etc)
of thin and sinuous elastic fibers, made up of elastin, fibrous protein made up of various amino-acids (especially proline and glycine but also cystine, histidine, hydroxiproline, desmosine and isodesmosine) which confers their elasticity to them.

The synthesis of elastin is ensured by the fibroblasts. It also contains microphone-fibrillary polymers of glycoprotéines of structures. During the Ageing, elastin splits up, the elastic fibers of the surface derm rarefy, and one sees appearing a mature élastose (wrinkles).

The elastic fibers and the collagen fibers form the fibrous protidic frame of the Derme.

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