title: [Ultrastructure of cellular features permitting the regulation of human cerebral cortex microcirculation].
abstract: Microglia-like cells and endothelial cells may influence capillary blood output. 1) Microglia-like cells are sometimes interposed between two endothelial processes with which they are nexus-linked. In this position, they protude in vascular lumen which is considerably reduced. 2) Endothelial cells present no contractile filaments but their nucleus and surrounding cytoplasm may protude in vascular lumen, constituting a "coussinet-like" structure. Thus, regulation by specialized structures observed by Legait in brain arteries seems to occur even in the smallest ramifications of brain cortical vessels.
mesh_terms: D002196:Capillaries / Q000648:ultrastructure; D002540:Cerebral Cortex / Q000098:blood supply* / Q000648:ultrastructure; D002560:Cerebrovascular Circulation; D004727:Endothelium / Q000648:ultrastructure; D006801:Humans; D008833:Microcirculation / Q000648:ultrastructure*; D008854:Microscopy, Electron; D009457:Neuroglia / Q000648:ultrastructure
vernacular_title: Aspects ultrastructuraux de dispositifs permettant la regulation de la microcirculation dans le cortex cérébral humain normal