The epithelial covering of the highly vascular embryonic placental villi, which invades the wall of the uterus to establish nutrient circulation between the embryo and the mother are:

1.chorionic villi cells2.cytotrophoblast cells
3.inner cell mass4.syncytiotrophoblast cells

Subtopic:  Implantation |
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Ectopic pregnancies are referred to as :

1.  pregnancies with a genetic abnormality
2.  implantation of the embryo at a site other than the uterus
3.  implantation of a defective embryo in the uterus
4.  pregnancies terminated due to hormonal imbalance
Subtopic:  Implantation |
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