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Implantation this is the embedding and attaching of the embryo in the uterine wall/endometiiu which marks the beginning of pregnancy. Sometimes implantation occurs in the oviduct Wall which is abnormal and results in ectopic pregnancy which is fatal.

The outer wall of the blastocyst develops finger like projections which project into the uterine wall for attachment,the projections are called villi.

The villi and endometrium develop into an organ that is called the placenta, the embryo is attached to the placenta through a cord called the umbilical cord.

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