According to the sources, the process of ovulation involves the rupture of a mature Graafian follicle to release an ovum , . Immediately after this event, the remaining parts or remnants of the ruptured follicle are transformed into a yellow endocrine structure known as the corpus luteum , . This conversion is induced by the luteinising hormone (LH), and the corpus luteum subsequently secretes large amounts of progesterone to maintain the uterine lining for potential pregnancy , .