Definition: an amorphous extracellular layer applied to the basal surface of epithelium and also investing muscle cells, fat cells, and Schwann cells; thought to be a selective filter and to serve both structural and morphogenetic functions. Its principal component is a layer (consisting mostly of type IV collagen) called the lamina densa, which has a dense appearance under the electron microscope. On either side of the lamina densa are two less dense layers, called the lamina rarae.
Synonym(s): lamina densa
Search Stedman's Medical Dictionary
Examples: glitazone, GI cocktail, etc.