论文部分内容阅读
采用明胶墨汁灌注、光学显微镜下观察拍片、体视学测算等方法,对13例生后不足6个月的新生儿和婴儿脑标本视皮质软脑膜血管构筑进行定量分析。结果表明:视皮质软脑膜动脉有顶枕动脉、距状裂动脉、颞下后动脉、颞后动脉等4个来源,多以直角发出长、短分支,形成直线型和“Y”型吻合。其进入皮质穿入点的数密度以距状裂上、下唇的后段最高;中段次之;前段最低。提示人脑视皮质存在着多来源动脉血供及血管密度差异分布的特点。认为大脑中动脉和大脑后动脉分支间在枕极月状沟附近的丰富吻合是“黄斑回避”现象的解剖学基础。视皮质各段血管密度差异分布的形成可能是视皮质各段细胞分化和功能完善的先决条件
Thirteen cases of neonatal and infantile cerebral cortex were quantitatively analyzed by using gelatin ink perfusion, observation with optical microscope and stereological calculation. The results showed that there were four sources of occipital artery, parietal fissure artery, posterior temporal artery and temporal artery in the visual cortex. The cortical piamania had long and short branches at right angles and formed a linear and “Y” anastomosis. The number of its entry into the cortex into the cortex at a distance from the crack, the lower lip of the rear section of the highest; followed by the middle; the front section of the lowest. Suggesting that there are many sources of human cerebral cortex arterial blood supply and vascular density differences in the distribution of characteristics. It is believed that the rich anastomosis between the middle cerebral artery and the posterior cerebral artery branches near the occipital crescent sulcus is the anatomical basis of “macular avoidance” phenomenon. The formation of differential distribution of vascular density in each segment of the visual cortex may be a prerequisite for cell differentiation and functional refinement in various segments of the visual cortex