The blastocyst implants itself in the

Explanation

The endometrium is the inner glandular lining of the uterus, thickened and richly supplied with blood by progesterone during the secretory phase, which is exactly what implantation requires. The myometrium is the thick smooth muscle layer whose contractions expel the baby at birth, and the perimetrium is the outer covering. Implantation in the cervix or oviduct is an ectopic pregnancy and is dangerous.