In the uterus are the tube-like uterine glands, lined by ciliated columnar epithelium.

The uterine glands, on the other hand, decrease in activity and degenerate already 8 to 9 days after ovulation in absence of pregnancy.

Simple tubular uterine glands reach from the endometrial surface through to the base of the stroma, which also carries a rich blood supply of spiral arteries.

The morula enters the uterine cavity where it is immersed in the secretions of the uterine glands, ultimately forming a blastocyst.

This is an expansion of it, further developing the uterine glands, the zona compacta and the epithelium of decidual cells lining it.

The uterine glands synthesize or transport and secrete substances essential for survival and development of the embryo or fetus and associated extraembryonic membranes.

LHR immunoreactivity was also found in surface epithelium of the rat uterine cavity, epithelium of uterine glands (se and ug, Fig.

Some secretory components from the uterine glands are taken up by the secondary yolk sac lining the exocoelomic cavity during pregnancy, and may thereby assist in providing fetal nutrition.