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Download Printable Chapter. Steven B. Bleyl 1 and Gary C. Many events occur during prenatal development that are critical for the success of the pregnancy and, ultimately, the birth of a healthy child. Thus, embryologists and teratologists identify milestones of pregnancy periods and phases during which essential events occur. Normal development of the conceptus—the zygote, blastocyst, embryo, and fetus, depending on its stage of development, plus its supporting membranes and placenta—can be adversely affected by poor maternal health and nutrition, genetic mutation, exposures to exogenous agents or a combination of these factors. The focus of this chapter is on the timing of important events during pregnancy that may be disrupted by a teratogenic exposure Fig. The conceptus is susceptible to such exposures throughout in utero development and even postnatally, although there are critical periods in which the conceptus is highly susceptible that are dependent on the endpoint that is affected by the exposure. Moreover, the conceptus is conceived during fertilization as the male and female gametes—the sperm and egg—join together in the upper end of the oviduct Fallopian tube to form a single-cell zygote. Consequently, environmental exposures over the life span of the prospective mother or father both prenatally and postnatally; see discussion of gametogenesis below can impact the ability of their gametes to produce a successful pregnancy and the birth of a healthy child. Thus, susceptibility to teratogen exposure for a given conceptus actually begins even prior to when it is conceived. Figure 1. Timeline of important events during pregnancy that may be disrupted by a teratogenic exposure. Shown are the lengths of pregnancy in days , from conception or fertilization to birth , the span of the three trimesters 3 months each , the three periods of prenatal development egg, embryo, and fetus , key developmental events fertilization, cleavage, implantation, gastrulation, primary morphogenesis, organogenesis, and birth , and some outcomes of teratogenic exposure.

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Jennifer Lynn Lopez, better known as j. No note of confidence from her parents: a lot of people have the backing of family and friends which helps them catapult in life Jennifer Lopez had the opposite. JLo was never the one to back down from achieving what she had her heart set to and years later she became the first person to have a number one album and film in the same week. A species of mite is named after her: Litarachna Lopezae is a new species of pontarachnid mite discovered in a mesophotic coral reef ecosystem in mona passage off Puerto Rico named after Jennifer Lopez. Enter- Google images. Tags from the story. You may also like. Next article BMW wants to charge a subscription fee for already installed features like heated seats and adaptive cruise control.

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One week after getting married to Ben Affleck , Jennifer Lopez is celebrating another personal milestone: her 53rd birthday! Jennifer Lynn Affleck. Though Lopez decided to change her name legally following the July 17 wedding, she never plans to stop being J. Lo on a professional level. This is our temple, this is our body. In her People interview, Lopez also opened up about her relationship with Affleck — with whom she recently vacationed in Paris after the wedding, E! And that makes me feel really confident and beautiful. That makes me feel really beautiful too. The Hustlers star also took a moment to celebrate her own birthday, of course. See All Health Relationships Self.

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