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What structures are found in the medulla of a human ovary?

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Detailed cross-sectional illustration of a human ovary showing the stages of follicle development, ovulation, and corpus luteum formation, with labeled structures including primordial, primary, secondary, and mature follicles, a ruptured follicle releasing an ovum, and corpus luteum and albicans. An inset at the bottom shows the ovary's location in the female reproductive system. — ovary The steps of ovulation, beginning with a dormant primordial follicle that grows and matures and is eventually released from the ovary into the fallopian tube.

The medulla of a human ovary is the inner portion of the organ, located internal to the cortex. It contains the following structures:

Interstitial cells1
Fibrous tissue1
Blood vessels12
Lymphatic ducts (or lymphatic vessels)12
Nerves12

Additionally, in the medulla of the mammalian ovary near the hilus—the point where blood vessels and nerves enter the organ—there are small masses of blind tubules or solid cords known as the rete ovarii.2