Question

Describe the event that takes place after the fertilization of gametes in human females.

Answer 1

Dear Student
​​​​​​After the fertilized egg is implanted in uterus (week 1) there occurs formation of bilaminar embryo, deep implantation and uteroplacental circulation is established in the second week. Differentiation of primary germ layers occurs in third week where gastrulation occurs (trilaminar embryo). During the third week somites, chorionic villi and neurulation are formed. During the fourth to eighth week of fertilization primary organogenesis and placentation occurs.
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