UNUSUAL DEVELOPMENT OF BASEMENT MEMBRANE ABOUT SMALL BLOOD VESSELS

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Abstract
An electron microscope study of capillar-ies and small venules of the frog tongue and interdigital web often revealed basement membranes of extraordinary thickness. This thickness was due primarily to the coalescence of a thin endothelial basement membrane (700 A) and thicker accessory membranes associated with pericytes and adventitial cells. Multilayered structures at times surrounded small venules, producing broad perivascular zones of laminated membranes up to 2 [mu] thick in the tongue and 0.5 [mu] in the web.