The ovary is an important reproductive organ in females that plays an essential role in the production of ova and hormones. The ovary is composed of various structures, including the stroma, germinal epithelium, vitelline membrane, and Graafian follicle.

The Graafian follicle is a structure that houses the developing oocyte until it is released during ovulation. After ovulation, the Graafian follicle undergoes changes that enable it to act as an endocrine gland.

Following are the details of how the Graafian follicle acts as an endocrine gland after ovulation:

Secretion of progesterone: After ovulation, the Graafian follicle is transformed into the corpus luteum. The corpus luteum is a temporary endocrine gland that secretes progesterone, a hormone that prepares the uterus for implantation of a fertilized egg. Progesterone also inhibits the release of further follicle-stimulating hormone (FSH) and luteinizing hormone (LH) from the pituitary gland.

Secretion of estrogen: In addition to progesterone, the corpus luteum also secretes estrogen, a hormone that promotes the growth and development of the endometrium (lining of the uterus). Estrogen also stimulates the secretion of cervical mucus, which helps sperm to reach the egg.

Degeneration: If fertilization does not occur, the corpus luteum degenerates and becomes the corpus albicans. The corpus albicans is a small, white scar that marks the site where the corpus luteum once was.

In summary, the Graafian follicle acts as an endocrine gland after ovulation by secreting progesterone and estrogen, which help prepare the uterus for implantation and promote fertilization.

Corpus luteum is a glandular yellowbody, developed from the ruptured Graafian follicle after the release of ovum.Corpus luteum acts as a temporary endocrine gland secreting large quantity of progesterone and small amount of estrogen being influenced by LH.