How is corpus luteum formed? What is its function?

Explanation

Corpus luteum is formed after ovulation from the remaining follicular cells of mature graafian follicle. The antrum of the collapsed follicle fills with a partially clotted fluid. The follicular cells enlarge and fill with a yellow pigment, lutein. Such a follicle is called a corpus luteum yellow body. The lutein cells secrete small amount of estradiol hormone and significant amount of the progesterone hormone. Corpus luteum also secretes relaxin hormone. Progesterone hormone helps in maintenance of endometrial lining of uterus which is helping in maintenance of pregnancy.