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Williams Obstetrics, 23e
| Section II. Anatomy and Physiology > |
Chapter 3. Implantation, Embryogenesis, and Placental Development
Sections: Implantation, Embryogenesis, and Placental Development: Introduction, The Ovarian–Endometrial Cycle, The Decidua, Implantation, Placental Formation, and Fetal Membrane Development, Placental Hormones, Fetal Adrenal Gland Hormones, References.
Topics Discussed: embryologic development; ovum implantation; placentation.
Excerpt:"All obstetricians should be aware of the basic reproductive biological processes required for women to successfully achieve pregnancy. A number of abnormalities can affect each of these processes and lead to infertility or pregnancy loss. In most women, spontaneous, cyclical ovulation at 25- to 35-day intervals continues during almost 40 years between menarche and menopause. Without contraception, there are approximately 400 opportunities for pregnancy, which may occur with intercourse on any of 1200 days—the day of ovulation and its two preceding days. This narrow window for fertilization is controlled by tightly regulated production of ovarian steroids. These hormones promote optimal regeneration of endometrium after menstruation ends in preparation for the next implantation window...."
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