17.5 Female reproductive system and gametes
The female genitals comprise of the vulva, labia, vagina, clitoris, uterus, fallopian tubes and ovaries. In addition to the vaginal opening, the labia also protect the urethra. The clitoris is a small sensory organ, located toward the front of the vulva above the vagina.
The two ovaries are located in the lower abdomen. The ovaries produce hormones. During the menstrual cycle, the ovaries also produce ova or egg cells.
The fallopian tubes begin near the ovaries, and thin tubes lead to the uterus. The pear-shaped uterus has a thick muscular wall. The elastic muscles of the vagina can stretch during intercourse and childbirth.
At birth, a female has millions of oocytes in their ovaries. At the middle of each menstrual cycle, follicular cells leave the ovary together with a single ovum. This is called ovulation. The ovum, or egg cell, is about 0.1 millimeters in diameter. It is one of the largest cells in the human body, and it can just about be distinguished with the naked eye.