ANAT 1010 Lecture Notes - Lecture 9: Prenatal Development, List Of Mammalian Gestation Durations, Fetus
14 Dec 2018
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Implantation: embryonic development, fetal development, labor, parturition (birth, terminology of development: Gestation period: time span from fertilization to birth (38 weeks) Prenatal period (before birth): embryological development, developing human for the first 8 weeks after fertilization is known as an embryo, all principal adult organs are present fetal development: from 9 weeks until birth fetus. Prenatal development: the time from fertilization to birth includes both the embryonic and fetal periods. It is divided into period of 3 calendar months each, trimesters . 1st trimester the most critical stage of development: All of the major organ systems begin to form; because of the extensive + widespread activity, it is also the period when the developing organism is most vulnerable to the effects of drugs, radiation, and microbes. The 2nd trimester is characterized by the nearly complete development of organ systems. By the end of the stage, the fetus assumes distinctively human features.
