Basal Membrane

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Related to Basal Membrane: basal lamina

basal membrane

[′bā·səl ′mem‚brān]
The tissue beneath the pigment layer of the retina that forms the outer layer of the choroid.

Basal Membrane


in vertebrate animals and man, the boundary film between the epithelium (or endothelium) and underlying loose connective tissue from which it is formed. The basal membrane consists of a diffuse substance and the fibers embedded in it. It serves to strengthen the epithelial layer of cells and prevents its cells from shifting deep into the connective tissue. Impairment of the basal membrane causes the epithelium to grow into the underlying connective tissue (for example, in chronic inflammation and malignant degeneration). The fact that the basal membrane is permeable to some metabolites indicates that it plays a definite part in metabolism.

References in periodicals archive ?
CADASIL is diagnosed based upon granular osmiophilic deposits within the basal membrane of vascular smooth muscle cells of skin arterioles.
2,15) Molecular and immunohistochemical studies have shown that laminin-5, a basal membrane glycoprotein, is one of the most prominent autoantigens in cicatricial penphigoid.
Focal thickening of the basal membrane was evident.
phyllinus have characteristics of fluid transport cells, based on a basal less acidophilic region that is indicated by the presence of a developed system of folds in the basal membrane.
Also, the urothelium is still present 28 days after implantation with a continued basal membrane.
Diagnosis: Trimma cheni has 8-9 scales in the predorsal midline, a row of 2-3 usually ctenoid scales along the upper border of the opercle, no cheek scales, a dark basal stripe in the dorsal fins, an elongate second dorsal spine reaching posteriorly to the bases of rays 1-4 of the second dorsal fin, the middle rays of the pectoral fin branched, a fifth pelvic fin ray which branches once dichotomously, the basal membrane connecting the inner margins of the fifth pelvic fins rays is less than 15% the length of the fifth ray, the scale pockets are not distinctly outlined with darker pigment, and, in life, there are two red to orange bars across the cheek and three diffuse yellow stripes on the body (most obvious along the caudal peduncle).