Observation on ultrastructure showed where the collagenous fibrils were intact , fibrioblast with active function were found in hypodermatic connective tissues , the basal lamina were intact , the epidermoid cells were well differentiated .
Abstract blood-brain barrier ( bbb ) , which is formed by a complex system of cerebral microvascular endothelial cells , astroglia , pericytes , perivascular macrophages , and a basal lamina , plays an important role in maintaining the normal functions of the central nervous system .