What is contained within a Graafian follicle?

A Graafian follicle, also known as a mature ovarian follicle, primarily contains the ovum, which is the female gamete or egg. As the follicle matures, it enlarges and fills with fluid while the ovum is encased within layers of specialized cells. This structure is essential for the process of ovulation, where the ovum is released into the fallopian tube for potential fertilization.

The other options provided do not accurately represent components found within a Graafian follicle. A fertilized egg would not be present since fertilization occurs after ovulation when sperm meets the ovum. The placenta is formed during pregnancy from the trophoblast of the fertilized egg and is not part of the follicular structure. The endometrial lining refers to the inner lining of the uterus and is involved in the implantation of a fertilized egg, not directly related to the contents of a Graafian follicle. Therefore, the ovum is the correct and relevant component contained within a Graafian follicle.