胚外中胚层在妊娠的第6.5至7.0天之间通过原始条带迁移到推测的卵黄囊。
Extraembryonic mesoderm migrates through primitive streak to the presumptive yolk sac between days 6.5 and 7.0 of gestation.
目的观察双刀劈核法在小切口白内障囊外摘出术中应用的效果。
Objective To observe the clinical effect of two knives horizontal nucleus chopping on small incision extracapsular cataract extraction.
结果：1）枯萎卵妊娠的胎囊内只有囊液，没有胚胎组织。 妊娠囊外没有绒毛组织或绒毛组织较稀疏。
Results:1) There is no embryonic tissue in gestation sac without or with little villous tissue in anembryonic pregnancy.
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