Which phase of the menstrual cycle involves the shedding of the uterine lining?

The phase of the menstrual cycle that involves the shedding of the uterine lining is Menses. During this phase, which typically lasts from three to seven days, the endometrium (the lining of the uterus) is lost through the vagina. This process occurs when there is no implantation of a fertilized egg after ovulation, leading to a decrease in certain hormones such as estrogen and progesterone. As these hormone levels drop, the uterine lining, which has thickened in preparation for a potential pregnancy, is no longer maintained and is expelled from the body.

Understanding the context of the menstrual cycle phases highlights the role of Menses distinctly. The Follicular Phase involves the development of follicles in the ovaries and the thickening of the uterine lining, while the Luteal Phase occurs after ovulation and is characterized by the preparation for potential pregnancy. The Ovulatory Phase is when an egg is released from a mature follicle. None of these phases involves the shedding of the uterine lining; that process specifically occurs during Menses.