Final answer:
The hilum of each ovary is where ovarian arteries and veins, along with nerves, enter and exit, providing blood supply and hormonal communication. During ovulation, eggs are released and enter the fallopian tube with the help of its fringelike structure.
Step-by-step explanation:
The hilum of each ovary is the point at which structures such as blood vessels, lymphatic vessels, and nerves enter and leave the ovary, much like how the renal hilum serves the kidneys. Specific to the ovaries, the ovarian arteries and ovarian veins are the blood vessels that respectively deliver blood to and remove blood from the ovaries. Additionally, the ovarian hilum is the point of attachment for the ligaments that hold the ovaries in place within the abdominal cavity.
During the menstrual cycle, as eggs develop within the ovarian follicles, they are eventually released during ovulation. Once ovulated, the egg is captured by the fringelike end of the fallopian tube and begins its travel towards the uterus. The remaining follicular tissue forms the corpus luteum, which secretes hormones necessary for maintaining the uterine lining.