Article on Why 2nd Week Of Development Is Called Week Of Twos.

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2nd Week 

 

Why 2nd Week Of Development Is Called Week Of Twos

The second week of development is known as the week of twos:

·       The trophoblast differentiates into two layers, the cytotrophoblast and syncytiotro-phoblast.

·       The embryoblast forms two layers, the epiblast and hypoblast.

·       The extraembryonic mesoderm splits into two layers, the somatopleure andsplanchnopleure.

·            And two cavities, the amniotic and yolk sac cavities, form.Implantation occurs at the end of the first week. Trophoblast cells invade the epithelium and underlying endometrial stroma with the help of proteolytic en-zymes. Implantation may also occur outside the uterus, such as in the rectouter-ine pouch, on the mesentery, in the uterine tube, or in the ovary (ectopic preg-nancies)






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