functional layer is the name of the portion of the uterine endometrium that is shed every month.
functional layer is the name of the portion of the uterine endometrium that is shed every month.
what is the name of the portion of the uterine endometrium that is shed every month?
functional layer
the endometrium is the inner epithelial layer, along with its mucous membrane, of the mammalian uterus. it has a basal layer and a functional layer; the functional layer thickens and then is shed during menstruation in humans and some other mammals, including apes, old world monkeys, some species of bat, and the elephant shrew. in most other mammals, the endometrium is reabsorbed in the estrous cycle. during pregnancy, the glands and blood vessels in the endometrium further increase in size and number. vascular spaces fuse and become interconnected, forming the placenta, which supplies oxygen and nutrition to the embryo and fetus. the speculated presence of an endometrial microbiota
endometrium
l-selectin is also present on the surface of human embryo trophoblasts prior to implantation into the uterus. similar to its function in lymphocytes, l-selectin acts as a receptor to facilitate adhesion of the embryo to the site of invasion on the surface epithelium of the uterine endometrium. the embryo secretes human chorionic gonadotropin (hcg), which downregulates anti-adhesion factor, muc-1, located on the uterine epithelium at the site of invasion. removal of muc-1 exposes the oligosaccharide ligands of the uterine epithelium, thus allowing binding by the l-selectin receptor of the trophopblast cell, followed by embryo adhesion and invasion.
l-selectin