Basal Membrane
The basal membrane is a particular extracellular matrix which one finds with the interface between a epithelium and another fabric. Its permeability controls the exchanges of Molécule S, in particular of Nutriment S, between two fabrics. It also contributes to the structural cohesion of the epithelium.
It consists of a basal blade of epithelial origin and of a reticular blade of conjunctive origin. This reticular blade can be more or less thick; when it is too fine, one cannot see the basal membrane in optical Microscopie, but it is always visible in electronic Microscopie.
It consists of molecules the such Laminine, the Collagène of the type IV and VII, as well as Glycosaminoglycane S, colourable with APS, and fibers of Réticuline in network.
On the level of the Skin, the basal membrane separates the cells from the skin and the Derme. The germinatives cells of the skin are fixed at the basal membrane by Hémidesmosome S.
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