说脐孔(俗称肚脐),必然要扯到与脐孔有关的脐带。脐带是胚胎发育过程中子附母的 “生命线”,在这条生命线中有两条动脉一条静脉,吐故纳新的物质运动就是由它们来完成的。除此之外,脐带内还有已闭锁的卵黄管和尿囊管。胚胎在正常衍化过程中,卵黄管与肠管、尿囊管与膀胱应逐渐闭锁分离,若胚胎在发育过程中受到这样或那样内外因素的影响,卵黄管与尿囊管就会发生各种变异而继 Said umbilical hole (commonly known as the navel), inevitably want to pull and the umbilical cord associated umbilical cord. The umbilical cord is the “lifeline” of the child attached to the embryo during its development. There are two arteries in this lifeline, and the new material movement is accomplished by them. In addition, the umbilical cord has locked the yolk tube and allantoic tube. Embryos in the normal derivatization process, the vial and intestine, allantoic and bladder should be gradually blocked separation, if the embryo during development by one or more of the internal and external factors, the yolk and allantoic tube will occur a variety of variations Following