Embryo 40 Day Old Heart and Liver: Computer Generated Image from Micro-MRI, actual size of embryo = 8.0 mm - This image of the embryo presented from the left-dorsal side shows the internal organs during the sixth week of embryonic development. This age is calculated from the day of fertilization. The prominent C-shaped curvature of the spinal cord (in red) remains. The chambered heart, marked in red, can be seen from the backside perspective. The liver is highlighted in violet. Veins and blood vessels connect the heart to the brain to supply nutrients and oxygen.
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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