The corpus luteum is best described as what type of structure?

The corpus luteum is best described as a structure that forms from the remains of a follicle after ovulation occurs. After an ovary releases an egg during the menstrual cycle, the ruptured follicle transforms into the corpus luteum. This structure is essential because it produces hormones, primarily progesterone, which is critical for maintaining the uterine lining, should fertilization occur. The functional role of the corpus luteum is vital in the early stages of pregnancy, as it supports the endometrium and helps regulate the menstrual cycle if pregnancy does not happen. Understanding this process highlights the significance of the corpus luteum in reproductive biology, distinguishing it from other follicular stages like immature graafian follicles or primary follicles.