脑实质在胚胎发育的整个过程中,可受到很多因素的侵害,从而造成不同程度的发育障碍,严重者胎儿不能存活,其余则可导致脑实质的先天畸形。常见的脑实质发育异常有以下9种。1.无脑畸形:系指脑全部或大部缺如,这种畸形伴有严重颅骨裂,颅顶和头皮缺如,在颅底上部覆有血管丰富的膜样组织,眼球突出,宽鼻圆嘴, The parenchyma in the embryonic development throughout the process, can be a lot of factors, resulting in varying degrees of developmental disorders, in severe cases the fetus can not survive, the rest can lead to congenital malformations of the brain. Common brain parenchymal development has the following nine kinds. 1. anencephaly: refers to all or most of the brain absent, this deformity with severe skull fracture, skull and scalp absent, covered in the top of the skull base vascular rich membrane-like tissue, prominent eyes, wide nose Round mouth,