| basement m. |
a sheet of amorphous extracellular material upon which the basal surfaces of epithelial cells rest; other cells associated with basement membranes are muscle cells, Schwann cells, fat cells, and capillaries. The membrane is interposed between the cellular elements and the underlying connective tissue. It comprises two layers, the basal lamina and the reticular lamina, and is composed of Type IV collagen (which is unique to basement membranes), laminin, fibronectin, and heparan sulfate proteoglycans. Click here to view image■Basement membrane, comprising the basal lamina and reticular lamina, in a diagram of a section through epithelial tissue.
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