In the absence of the implantation of a fertilized embryo, the menstrual phase of the uterine cycle is initiated by the degeneration of the

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The menstrual phase of the uterine cycle is initiated by the degeneration of the corpus luteum. If a fertilized embryo does not implant in the uterine lining, the corpus luteum, which produces hormones to support the early stages of pregnancy, degenerates. This leads to a decrease in hormone levels, causing the shedding of the uterine lining, known as menstruation.

In the Absence of the Implantation of a Fertilized Embryo