As seen with the electron microscope, the basement membrane is composed of two layers, the basal lamina and the reticular lamina. [4] The underlying connective tissue attaches to the basal lamina with collagen VII anchoring fibrils and fibrillin microfibrils .

The basement membrane (Terminologia histologica: Membrana basalis) is a homogenous layer of the extracellular space located closely beneath basal epithelial cells or membranes of some special types of cells (see below). The name basement membrane derives from light microscopic appearance.

The microscopic structure of the alveolar walls (or alveolar septa) consists, from blood to air, of the following (Weibel 1963, Weibel 1988): the capillary endothelium lining the network of anastomotic capillaries; a basement membrane and surrounding interstitial tissue separating the endothelial cell from the alveolar lining epithelial cells ...

lar fibril layer represent the basement membrane recognizable by light microscopy. The two terms - basal lamina and basement membrane - are used as synonyms. It should be noted, however, that, whereas most of the components of the basal lamina are produced by the cell resting on the basal lamina

The basement membrane is a tiny extracellular col-lagenous lamina usually interposed between connective tissue space and bordering tissue(s). According to Pease (1) its presence allows the remarkable histological order and complexity of the multicellu-lar organisms....