Female Reproductive System (cont.)

Medical Author:
Medical Editor:

External reproductive organs

The labia majora are two fleshy protrusions that protect and envelop the other external reproductive organs. They are covered with hair after puberty, and are comparable to the scrotum in males. They contain glands that produce sweat and oils. Inside the labia majora are the labia minora, smaller protrusions of flesh that surround the openings to the urethra (that allows passage or urine) and the vagina. Located next to the vaginal opening are glands that produce mucus known as Bartholin's glands. At the junction of the labia minora is the clitoris, a small structure that is covered by a skin fold called the prepuce. The clitoris is comparable to the penis in males and is highly sensitive.

The menstrual cycle

The menstrual cycle is the monthly cycle of follicle and egg maturation, release of an egg (ovulation), and preparation of the uterine lining for pregnancy. If a woman does not become pregnant, the uterine lining tissue is shed as menstrual bleeding. Most menstrual cycles are 28 days in length. Menarche is the time in during adolescence when menstrual periods begin. Menstrual periods continue to occur until a woman reaches menopause.

Follicular phase

The follicular phase is the beginning of the menstrual cycle. It starts on the first day of the menstrual cycle and usually lasts about 14 days. The hormones follicle-stimulating hormone (FSH) and luteinizing hormone (LH) are released from the pituitary gland to stimulate the ovaries. In turn, the ovaries produce estrogen and stimulate the maturation of about 15 to 20 eggs in the ovaries inside small areas known as follicles. Once estrogen levels begin to rise, the secretion of FSH is reduced by a feedback system so that follicle stimulation ceases at the appropriate time. With time, one of the egg follicles (or rarely, two or more) becomes dominant, and maturation of the other follicles is interrupted. The dominant follicle continues to make estrogen.

Medically Reviewed by a Doctor on 8/6/2013


STAY INFORMED

Get the Latest health and medical information delivered direct to your inbox!