Sperm and egg not developing
Fertilization and Embryo Development ā Union between the sperm and egg must result. The first sperm, however, are likely not the fertilizing sperm.
Feb 6, An illustration of a sperm cell penetrating an egg. of healthy embryos, or the implantation of embryos with development problems, the researchers said. In some cases, these impaired embryos will not implant in the uterus.
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Description:Sperm Transport ā The sperm must be deposited and transported to the site of fertilization. Low fertilization, cleavage and embryo quality rates after ICSI have also been found by other groups 4 , 6 ā 8 , who compared the same parameters utilizing sperm from different sources: Motile sperm can survive in the female reproductive tract for up to five days. A possible explanation for this may be that testicular spermatozoa are less mature and subsequently less competent to fertilize than the ejaculated ones, since the final steps of sperm maturation take place in the epididymis 6 , 7. Evidence for a strong paternal effect on human preimplantation embryo development and blastocyst formation. But sometimes, the womb may make this exam too difficult or too easy, which could lead to the rejection of healthy embryos, or the implantation of embryos with development problems, the researchers said.
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