Résumé
Intracerebral vessels from 10 hemispheres of children were perfused with ABS and observed under the 6212-Ⅲ surgical microscope and TSM-Ⅰ scanning electron microscope.1. The arterial network of the pia mater shows irregular anastomoses. Many terminal branches in the meshwork do not form anastomosis but perforate into the brain tissue at right angle. Most of the points where the arteries perforate are longit udinally arranged along the gyri.2. The venous network of the pia mater usually lies deeper than the arteries and becomes superficial to the latter after joining together to form larger vessels.3. The cortical arteries have an average diameter of 44.3?m. They are densely distributed like hairs of a brush.4. The tributaries of the cortical veins join to form larger veins assuming the shape of an inverted fir tree.5. The medullary arteries are different in length and in diameter. The diameter averages 158.2?m. The arteries perforating through the top of the gyrus are straight but those from the sulcus bend to a certain degree after they pass through the cortex. Branches from the middle segments come out vertically and form "T"-shape branches. The deep segments send out branches like the roots of a tree and form widespread anastomoses with the central arteries. Wavy, tortuous medullary arteries can be also found. The casts of these arteries were observed under the SEM.The medullary veins and central arteries have been studied and described microanatomically.