What is formed in the ovary from follicle cells following ovulation?

After ovulation, when the mature follicle ruptures to release an oocyte, the remaining follicle cells undergo a transformation to form the corpus luteum. This structure plays a crucial role in the menstrual cycle as it secretes hormones, primarily progesterone, and some estrogen. The corpus luteum is essential for maintaining the uterine lining in the event of pregnancy. If fertilization does not occur, the corpus luteum eventually degenerates, leading to a decrease in hormone levels and the onset of menstruation. Hence, the formation of the corpus luteum from the follicle cells is a vital process in reproductive biology, closely linked to regulating the hormonal environment necessary for potential conception.