先天性束带和截肢的病因,过去认为是胚胎局部发育不良所致。本文通过显微镜对胎盘的研究,证实胚胎在发育时羊膜破裂,是促使2例婴儿的手指形成先天性束带和部分缺损的原因。羊膜的生存,大部有赖于羊膜内液体中保持适当氧的压力。若羊膜囊破裂,胎儿则占居于绒毛膜腔内。在这种生长过程中,羊膜和绒毛膜的残余物,可形成纤维束,使任何肢体受损,结果成为缺肢或有孔并指(趾)畸形。若破裂发生于4个月前,则绒毛膜中有如发细的 The causes of congenital lace and amputation, previously thought to be caused by poor local development of embryos. In this paper, microscopic examination of the placenta, embryonic development of amniotic membrane rupture confirmed, is to promote the fingers of two infants to form a congenital banding and partial defect causes. Survival of amniotic membrane, most rely on the amniotic fluid to maintain the appropriate pressure of oxygen. If the amniotic sac rupture, the fetus is living in the chorion cavity. During this growth, the amniotic membrane and chorionic remnants can form bundles of fibers that damage any limb, resulting in a limb or foramina and deformity of the digits. If rupture occurred 4 months ago, the chorionic hair as thin