Basal lamina: Difference between revisions

Revision as of 01:33, 6 February 2005

Revision as of 14:05, 13 July 2005

Line 1:

The '''basal lamina''' (previously called ''basement membrane'') is a layer on which [[epithelium]] sits. This layer is approximately 40-50 [[nanometre|nm]] thick and composed of the [[lumina lucida]] and the [[lumina densa]]. The lumina lucida is adjacent to the epithelial [[cell]]s and composed of [[laminin]] (a [[proteoglycanglycoprotein]]) and [[collagen]] (Type IV). The lumina densa is composed of [[collagen]] (Type VII).

Anchoring fibers extend into the underlying extracellular matrix and loop around [[collagen]] bundles. Although found beneath all basal laminae, they are especially numerous in stratified squamous cells of the skin.