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排卵、受精及受精卵的发育、输送和着床(模式图)

排卵、受精及受精卵的发育、输送和着床(模式图)

图示排卵,受精及受精卵的发育,输送和着床。排卵是指卵泡将卵细胞和它周围的一些细胞排出,卵子排除后,经输卵管伞部拾拣,开始沿着输卵管下行。数百万的精子则向上运行,在输卵管的壶腹部,精子和卵子结合,称为受精,整个受精过程大约需要24小时。受精卵进一步分裂成为桑椹胚,并向宫腔方向移动,受精后大概1周左右受精卵种植于宫腔底部。

Ovulation releases an egg from an ovarian follicle. The egg is swept into the fallopian tube and begins to descend. Spermatozoa (millions are represented here by one) begin ascending. Fertilization of the egg by a single sperm occurs in the ampullary portion of the fallopian tube about a day after ovulation. The fertilized egg begins to develop into the blastocyt on descent into the endometrial cavity, where implantation occurs on the wall of the fundus about a week after ovulation.


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