THE DISTRIBUTION OF INTRACEREBRAL ARTERIES IN THE NEWBORN / 解剖学报

ABSTRACT

Intracortical distribution of arteries were studied on thick sections prepared from brains of 11 newborns after injection and fixation. The results are as follows.1. Branches from the cerebral arteries form a pial arterial network on the cortical surface. The larger pial arteries are supplied with vasa-vasorum and perivascular vessels. They send out cortical and medullary arteries penetrating the cortex vertically from the surface.2. The distribution of arteries in the entire cortical area can be represented by the pattern observed in a single gyrus, which serves as a general rule. The cortical arteries arising from the pial arteries penetrate into the cortex vertically and are arranged regularly which appear as a brush border that curves with the cerebral surface in sections. The diameter of the long cortical arteries is 16～31 ?m, while that of the short ones is 7.5～15.4 ?m. All these arteries send out branches at right angles which anastomose with one another to form a dense polygonal or irregular vascular network.The medullary arteries pass directly through the cortex into medulla. The diameter of the long medullary arteries is 48～61 ?m and that of the short ones, 35～47 ?m. Those entering from the top of each gyrus pass directly to the deep medulla, whereas those from the sulcus to the junction between the cortex and medulla exhibit various degrees of curvature. The medullary arteries send out branches at right angle, which, in turn, form T-shaped bifurcations, interconnecting each other in an oblong lattice framework.3. The central arteries penetrate the base of the brain, fan out and arch upward to reach the corpus striatum. Arteries may penetrate into the thalamus from posteriolateral, inferio-medial or superior surface. They branch with acute angles and form dense network with polygonal, triangular, circular and irregular interspaces. The arteries of the internal capsule also branch at right angles, show "T" bifurcations after a short distance and form an oblong vascular network.