Word: uteruses
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Vanderbilt's Soupart gives least three reasons for failure: 1) difficulties in the tiny egg the culture chamber into the uterus, 2) undetected chromosomal abnormalities that doom the egg before it has a chance to implant itself, and 3) interference in the acceptance of the egg by the very hormones that were used to encourage ovulation...
Under normal circumstances, pregnancy occurs when an ovum, or egg cell, released by a woman's ovary during ovulation is fertilized as it passes through the fallopian tube, successfully penetrated by just a single sperm that has traveled through the uterus. After the fertilized egg undergoes a number of cell divisions, the tiny clump of cells enters the uterus, where it burrows into the wall and develops for nine months or so until birth...
...when an ovum, or egg cell, released by a woman's ovary during ovulation is fertilized in the fallopian tube by a single sperm that has traveled up from the vagina. After the fertilized egg undergoes a number of cell divisions, the tiny clump of cells enters the uterus, where it burrows into the wall and develops until birth. But the Browns, married nine years, had been unable to conceive a child because of Lesley's faulty fallopian tubes. "Three years ago," Lesley says, "we were told that there was no chance that I could ever conceive...
...cells, then four, then eight, and so on. A few days later, the conceptus had reached the blastocyst stage: an aggregate of cells in the form of a hollow sphere. Ordinarily, fertilization and this initial division would take place as the egg traveled through the fallopian tube to the uterus. Thus it was at this point that the laboratory conceptus was introduced into Lesley Brown's womb...
...argument over abortion will never be settled. The most effective course is to concentrate on 1) creating totally effective contraception and 2) developing neonatal care technology so that an embryo or fetus of any age could be nurtured outside the womb or even transferred to the uterus of a woman desiring a child...