1. The endometrium - the mucosa
2. The myometrium - a tunic of smooth muscle
3. The perimetrium - the peritoneal serosa
At implantation the endometrium
is in its secretory phase. This
phase starts after ovulation
and depends upon the formation of the corpus luteum, which secretes progesterone. The mucosa is swollen at fertilization and ready to receive the blastocyst