The uterus is of course the protagonist of this book, the absolute number one. As the name suggests, the uterus is a palace in the female body for the offspring to live temporarily, hidden deep in the middle of the female lower abdomen pelvis, protected by a circle of bones (pelvis). So, what is the body of the protagonist who is contained but not revealed? How does she look? How big is this thing? Let us together, lightly dial the curtain of incense to see the real face! In ancient Chinese mythology, the chaotic world before Pan Gu opened up the sky and opened up the earth, is perhaps a vague memory of human life in the Matrix. What kind of place in the mother’s body did people live before they came to this strange and exotic world of flowers? I tell you, it is the uterus. The uterus is the female internal reproductive organ that plays an important role in the longevity of a woman’s life and human reproduction: it is the place where the human fetus develops and it is the birthplace of a woman’s monthly biological cycle (menstruation). These two skills are enough to make it a prominent and deservedly the most characteristic female body symbol! So, we respectfully call it the “Womb Queen”. Where does the Womb Queen live? To be more elegant, it is located below the beautiful navel, slightly raised abdomen deep (pelvic), surrounded by a circle of solid bones (pelvis) like a copper wall close protection. The pelvis is a fruit basket-like structure that protects the uterus in every way. Moreover, the fetus has to adapt to the shape of the pelvis to leave the mother’s body after maturity, and it takes a rather tortuous path to be born into the world. In front of the uterus is the bladder, where urine is stored, and behind the uterus is the rectum, where the stool passes. Although the bladder, uterus and rectum are arranged in a close relationship from front to back, they belong to different “departments”, which belong to the urinary system, reproductive system and digestive system respectively. People are higher animals, these three systems are separate, while some of the lower animals (such as chickens and ducks), the exit of the three systems are together, called “cloaca”. The appearance of the mother is not closed, the uterus like an inverted duck pear (please note that the northern duck pear, not snow pear), some say more like a standing incandescent bulb. The large upper part is called the “body of the uterus” and the small lower part is called the “cervix”. The cervix is partly exposed in the vagina and has a diameter of about the width of 2 to 3 fingers side by side (3 cm to 5 cm) and can be seen by the doctor with the help of special instruments. There is not much to say about the cervix for now, as later on there will be a major story about the big and small things that happen on this square piece of land (cervical lesions and cervical cancer). The body of the uterus is located entirely within the pelvic cavity, which cannot be seen by the naked eye and cannot be touched by women themselves under normal circumstances, while doctors can feel it through gynecological examinations. But when it comes to the body of the uterus, it is definitely a woman who can bend and stretch. When not pregnant, the uterus is one or two turns smaller than a woman’s own fist (height, width and thickness are about 6 cm, 5 cm and 4 cm respectively); while at the full term of pregnancy, the uterus can expand to several turns larger than a basketball, or like a watermelon of about 30 pounds (about 20 cm in diameter). If the uterus grows a tumor (fibroids), it can be so fat that it fills the entire abdominal cavity, weighing up to tens of kilograms. In fact, the uterus is not really a solid lump like a duck pear, but an organ with a cavity in the middle. The middle cavity is called the “uterine cavity”, it is the place where the fetus develops in the mother’s body, is the first set of living rooms that everyone has. The Creator is actually fair, no matter how different people are in the world today, some people have luxury houses and villas, some people live underground, but before the birth, the living conditions are basically equal. The inner surface of the house called the “uterine cavity” is lined with a layer of membranous tissue called the “endometrium”, which can be nearly 2 cm thick. The function of the endometrium is not to be underestimated: when it undertakes the task of pregnancy, it is the fertile soil where the golden seed (fertilized egg) that develops into a fetus thrives; during the youthful and passionate years (childbearing years) when there is no task of pregnancy and childbirth, this membrane is shed once a month and is expelled through the vagina to form menstruation. The walls of this house, the tissues that make up the uterine cavity, are called “myometrium” and consist of three layers of muscles (smooth muscles of the uterus) arranged in different directions in a regular pattern: inner ring, outer longitudinal and middle cross. It is this arrangement that makes the uterus very strong and has amazing stretchability. The outside of the uterine wall also has a membrane called the “plasma membrane”. This membrane is so thin that it is indistinguishable from the peritoneum, which covers the surface of the bladder and intestinal canal.