The parieto-occipital sulcus disappears on the 1-2 sections from the cingulate gyrus will disappear to the paracentral lobule will appear. 当大脑半球出现半卵圆中心上部时,从扣带回顶部出现到中央旁小叶即将出现的1~2个断面,为顶枕沟消失的断面。
Parieto-occipital and serrated sulcus began to emerge in the 4th month and were fully formed in the 6th month; 顶枕沟和距状沟从第4月龄开始出现,至第6月全部出现;