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Prenatal development


Embryo 56 Day Old Heart and Blood Vessel: Computer Generated Image from Micro-MRI, actual size of embryo = 30.0 mm - This image provides a right-sided perspective of an embryo during its eighth week of development. The age is calculated from the day of fertilization. The skin has been made translucent so that internal organs can be observed. The brain is highlighted in yellow-orange. Red blood vessels branching from the functionally complete, four-chambered heart, indicated in red, extend towards the brain. In the facial region, the red circle indicates the eye. The liver, shown in pale yellow, is situated below the heart.

Prenatal or antenatal development is the process in which a human embryo or fetus (or foetus) gestates during pregnancy, from fertilization until birth. Often, the terms fetal development, foetal development, or embryology are used in a similar sense.

After fertilization, the process of embryogenesis, (the early stages of prenatal development) begins. By the end of the tenth week of gestational age the embryo has acquired its basic form and the next period is that of fetal development where the organs become fully developed. This fetal period is described both topically (by organ) and chronologically (by time) with major occurrences being listed by gestational age.


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Prenatal development

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