Final answer:
The anterior pituitary secretes FSH and LH in response to decreased levels of estrogen and progesterone due to the degeneration of the corpus luteum, subsequently initiating the next menstrual cycle.
Step-by-step explanation:
The loss of estrogen and progesterone from the corpus luteum at the end of the ovarian cycle stimulates the anterior pituitary to secrete FSH (Follicle-Stimulating Hormone) and LH (Luteinizing Hormone).
When no fertilized egg is implanted into the uterus, the corpus luteum degenerates, causing a reduction in the levels of estrogen and progesterone. The decrease in progesterone relieves the inhibition on the hypothalamus, which, in turn, signals the anterior pituitary to release FSH and LH, initiating the next menstrual cycle and preparing the body for the next potential pregnancy.