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Endometriosis can also impact a woman's fetus or neonate, increasing the risks for congenital malformations, preterm delivery and higher neonatal death rates. [46] Endometriosis can lead to ovarian cysts (endometriomas), adhesions, and damage to the fallopian tubes or ovaries, all of which can interfere with ovulation and fertilization.
Endometriosis often presents with a very diverse array of symptoms, such as dysmenorrhea (pain during menstruation), cyclical pelvic pain (generalized pain in the lower abdomen that predictably worsens with menstruation), dyspareunia (pain during intercourse), or infertility (inability to achieve a pregnancy with unprotected intercourse for > 1 year).
Human embryology is the study of this development during the first eight weeks after fertilization. The normal period of gestation (pregnancy) is about nine months or 36 weeks. The germinal stage refers to the time from fertilization through the development of the early embryo until implantation is completed in the uterus .
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In humans, decidualization occurs after ovulation during the menstrual cycle. After implantation of the embryo, the decidua further develops to mediate the process of placentation. In the event no embryo is implanted, the decidualized endometrial lining is shed or, as is the case with species that follow the estrous cycle, absorbed. [1]
However, such low thickness rarely occurs, and any routine use of this parameter is regarded as not justified. The optimal endometrial thickness is 10mm. Nevertheless, in human a perfect synchrony is not necessary; if the endometrium is not ready to receive the embryo an ectopic pregnancy may occur.
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Fertilization of the ovum to form a new human organism, the human zygote. (day 1 of fertilization [1]) The zygote undergoes mitotic cellular divisions, but does not increase in size. This mitosis is also known as cleavage. A hollow cavity forms marking the blastocyst stage. (day 1.5–3 of fertilization. [1])