What phase begins after ovulation when the remnants of the graafian follicle restructure themselves?

The luteal phase is the stage that follows ovulation and is characterized by the transformation of the remnants of the graafian follicle into a structure known as the corpus luteum. After ovulation, the released egg leaves behind the follicle, which undergoes a restructuring process. The corpus luteum then plays a crucial role in the menstrual cycle by secreting hormones, primarily progesterone, which helps prepare the uterine lining for a potential implantation of a fertilized egg.

During this phase, if pregnancy does not occur, the corpus luteum eventually degenerates, leading to a decrease in hormone levels and the onset of menstruation. The luteal phase typically lasts about 14 days, which is a constant duration, making it distinct from the earlier follicular phase where the duration can vary. The secretory phase is often considered to coincide with the luteal phase but focuses specifically on the changes in the uterine lining in response to hormonal signals. Thus, the luteal phase is accurately identified as the phase that begins after ovulation when the graafian follicle restructures itself into the corpus luteum.