Female internal reproductive system anatomy

The female internal reproductive organs include the vagina, uterus, bilateral fallopian tubes, uterus and ovaries. The vagina is the reproductive organ of women, and is also the safe passage for menstruation to be discharged and the fetus to be born. The inner wall of the vagina has a layer of mucous membrane with many folds, so there is a very large telescopic space. When sexually excited, the fluid metabolized by the mucous membrane can lubricate the vagina and penis. Let’s learn more about the professional knowledge in these areas.

Characteristics of the uterus. The uterus is located in the pelvis in an inverted pear shape, and the surrounding tendons fix it in the pelvis. The uterine structure consists of three parts: the uterine body, uterine fundus and cervix. From puberty to menopause, a woman's uterine wall undergoes regular changes regulated by the body's female hormones, and can accept the implantation of a sperm-egg embryo at a certain time each month. The uterus is also the nursery for creating the fetus. The volume of the uterus does not exceed 10ml before pregnancy, and reaches 4000ml at full-term pregnancy; the weight of the uterus also increases from about 50 grams to about 1000 grams to meet the needs of creating a fetus.

Function of the ovaries. The uterus and ovaries are located on both sides of the uterus, behind and below the fallopian tubes, one on each side. The uterus and ovaries are oval in shape and are fixed in the pelvis by tendons. The uterus and ovaries secrete eggs and secrete female hormones. Estrogen maintains a woman's secondary sexual characteristics, such as breast protrusion, fat accumulation, sharp pronunciation, etc.; it also maintains a woman's sexual function, and it acts throughout the body through the blood circulation system. From puberty to menopause, that is, from about 13 to 49 years old, women discharge a perfect egg cell every month.

Safe passage for egg cells. After the perfected egg cell is discharged from the uterus and ovaries, it is entered into the bilateral fallopian tubes from the abdomen through the fimbria of the bilateral fallopian tubes. The fallopian tubes are located on both sides of the uterus, and the mucous membranes in their cavities are completely covered with movable microvilli. After the egg cells enter the fallopian tubes, they rely on the peristalsis of the fallopian tubes and the movement of the microvilli to gradually move toward the uterus. At this time, if it encounters sperm, it will fuse into a sperm-egg combination, which will continue to decompose and grow while moving towards the uterus, and then enter the uterus to implant the embryo. If the egg cell is not fertilized, it will spontaneously decay after entering the uterus.