On the section through the interventricular foramen, the signal of the disappearing of the angular gyrus was the shape of the lateral sulcus changed into "Y" and the structure of the temporal lobe can be seen. 经室间孔的断面:在切及颞叶结构时,大脑外侧沟由一变为人字形时,是角回消失的标志。
In horizontal plane: on the section through the paracentral lobule, when the angular gyrus and supramarginal gyrus appeared, the simultaneity of the cingulated gyrus and parietooccipital sulcus appeared, the cingulated sulcus and the marginal ramus disappeared. 在横断面上:①经中央旁小叶的断面:扣带回和顶枕沟的出现,伴有扣带沟缘支的消失,是角回和缘上回出现的标志。