The vagina is a muscular tube composed of mucous membranes, muscular layers and adventitia, rich in extensibility, connecting the uterus and external genitalia. It is the female sexual organ and the conduit for menstruation and delivery of the fetus.
Structural features of a woman's vagina
The structure of the vagina is mainly narrow at the lower part, and the lower end opens into the vestibule of the vagina through the vaginal opening. In the virgin stage, there is a hymen attached around the vaginal opening, which can be annular, half-moon, umbrella or sieve. After the hymen is ruptured, a hymen scar is left around the vaginal opening.
The upper end of the vagina is wide and wraps around the cervix and vagina, forming an annular depression between the two, called the vaginal dome, which can be divided into anterior, posterior and two lateral parts. The posterior part of the vaginal dome is the deepest, and is closely adjacent to the rectum-uterine depression, separated only by the vaginal wall and a layer of peritoneum. Clinically, it has great practical significance, such as the ability to drain the effusion in the depression through the posterior fornix.
The physiological function of a woman's vagina
The vagina is a very important conduit that connects the female internal and external genitalia. It is the female sexual organ and the channel for the discharge of menstrual blood and the delivery of the fetus. The upper end of the vagina is connected to the uterus, and its lower end is the vaginal opening. The front of the vagina is adjacent to the bladder and urethra, and the back is connected to the rectum and perineum. Because there is a bladder in front of the vagina and a rectum in the back, if it takes too long to give birth to a child, the head of the fetus presses against the vaginal wall for too long, which can lead to the necrosis of the vaginal wall due to hypoxia and ischemia, resulting in serious leakage of urine and feces. . Therefore, it is not advisable to prolong the labor process during labor.
Physiological function
①The channel that transports menstrual blood from the uterus to the outside of the body.
②An important place for women to have sex. The anterior wall of the lower vaginal segment is particularly sensitive to sexual activity.
③ Under normal circumstances, the vagina is the channel through which the fetus is delivered from the mother.
④ The vagina is the window for examining the female internal genitalia.
Physiological characteristics
①The potential for stretching and adjustment of the female vagina is sometimes quite amazing.
② Each segment of the vagina responds differently to sexual stimulation. For example, one-third of the outer vaginal segment is differentiated from ectoderm and is rich in nerve fibers, so the nerve endings that respond to touch are only concentrated near the vaginal opening. The inner 2/3 of the vagina is from the mesoderm and has no nerve endings, so the outer 1/3 of the vagina is more sexually sensitive than the inner 2/3. As far as the penis is concerned, although the size of the penis varies greatly during relaxation, the difference after erection decreases. Generally speaking, the depth of the outer vaginal segment can be greatly exceeded after erection. Therefore, the determinant of female sexual satisfaction is by no means the penis. size thickness.
③Another important physiological feature of the vagina is that it has abundant muscles around it, called the pubococcygeus muscle.
④ The vagina itself has no secretory glands.
A few secrets about a woman's vagina
1. How deep is a woman's vagina?
A woman's vagina is normally 9-10cm, but there is no specific length during sexual intercourse. Because the muscle tissue of the vagina has a retractable function, it will be adjusted according to the length of the penis during sexual intercourse, so the phenomenon of "bottoming" when the male penis enters the vagina will not appear.
A woman's vagina also elongates after childbirth, usually by 2-3 cm. And with each delivery, the vagina gradually grows. But these do not appear on the surface of the vagina, so it is impossible to tell whether a woman is fertile from the appearance.
Second, the vagina will also have wrinkles?
The skin of the body changes with age, and so does the private parts. When a woman reaches a certain age, estrogen levels drop, and the body loses collagen, causing wrinkles in the labia.
3. Do women have vaginal odor?
A woman's vagina will secrete fluid under stimulation, and usually also secrete leucorrhea, so it is impossible to say that it has no taste at all. The normal odor is light fishy, sweaty or sour. If there is a fishy smell, rancid smell or a special smell, there may be gynecological diseases. However, the internal environment of the normal vagina is acidic, which is conducive to sterilization and prevention of infection, so the secretions of women are slightly fishy, sour, cool and mucus.
4. Are all women's vaginas the same?
I believe that many women will be curious about a question: Do women's vaginas all look the same? In fact, the female genitalia are the same in appearance, but there are certain differences in the length of the vagina and the size of the labia.
