1. Endometrium: The innermost layer of the uterus, the endometrium is a mucous membrane that thickens and sheds during the menstrual cycle. It is where a fertilized egg implants and grows during pregnancy.
2. Myometrium: The middle layer of the uterus, the myometrium is made up of smooth muscle tissue that contracts during labor to push the baby out of the uterus. It also contracts during menstruation to shed the endometrium.
3. Perimetrium: The outermost layer of the uterus, the perimetrium is a thin layer of connective tissue that covers and protects the uterus.