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embryologic development |
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embryologic development [-loj′ik] the various intrauterine stages and processes involved in the growth and differentiation of the conceptus from the time of fertilization of the ovum until the eighth week of gestation. The stages are related to the biologic status of the unborn child and involve the differentiation of the various cells, tissues, and organ systems and the development of the main external features of the embryo. It occurs from approximately the end of the second week to the eighth week of intrauterine life. The fetal stage follows these stages, beginning at about the ninth week of gestation. The entire process of growth and development of the embryo and fetus is loosely called prenatal development. See also prenatal development. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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The embryologic development of the head and neck is directed by an ensemble of numerous genes. A plausible explanation for decreased to absent staining in these carcinoids may reflect patterns of embryologic development. Esophageal inlet patch is considered a congenital anomaly, a remnant of gastric mucosa which is left behind during the descent of the stomach in embryologic development. |
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