title: Electron microscopic study on the medial defect at the apex of human cerebral arterial bifurcations.
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D001485:Basement Membrane / Q000648:ultrastructure; D002536:Cerebral Arteries / Q000648:ultrastructure*; D002648:Child; D002675:Child, Preschool; D005260:Female; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D002532:Intracranial Aneurysm / Q000209:etiology; D008297:Male; D008854:Microscopy, Electron; D008875:Middle Aged; D009130:Muscle, Smooth / Q000648:ultrastructure; D009336:Necrosis