Endometrium

Definition

The endometrium is the inner lining of the uterus, which thickens during the menstrual cycle in preparation for possible implantation of an embryo. It is shed during menstruation if implantation does not occur.

Related terms

Menstrual Cycle:

The monthly hormonal cycle a woman's body goes through to prepare for pregnancy, culminating in menstruation if no pregnancy occurs.

Implantation:

The process by which a fertilized egg attaches itself to the endometrial lining of the uterus to begin pregnancy.

Estrogen:

A hormone that plays a key role in regulating the menstrual cycle and preparing the endometrium for implantation