The vagina is a flexible tubular organ located between the bladder, urethra and rectum. It has a variety of physiological functions in the process of human reproduction. It is the channel connecting the uterus and the vulva. It is the only way to discharge menstrual blood and deliver babies. It is also an important sexual intercourse organ.
Usually, the front and back walls of the vagina are close to each other so that the cross section is "H" shaped. The upper segment is bent downward and backward, close to the sacral concave, and its lower end is bent forward, making the sagittal plane of the vagina an "S" shape. The upper end of the vagina is wider and surrounds the cervix. The annular space between the cervix and the vaginal wall, called the vaginal fornix, is divided into four parts: anterior, posterior, and left and right according to its location. The posterior fornix as the semen reservoir is particularly deep and wide. In the lithotomy position of the bladder, the posterior fornix of the vagina is the lowest position of the vagina. this anatomical relationship is conducive to the surging of sperm from the vagina to the cervix, because the external os of the cervix is in the normal position. against the posterior fornix of the vagina. The posterior fornix is the most dilatable part of the vagina, providing the necessary space for an erect penis while preventing excessive displacement of the cervix and possible dyspareunia.
In-depth explanation of the vagina:
The upper end of the vagina is wider than the lower end, the back wall is about 10 to 12 cm long, and the front wall is about 7 to 9 cm long. Generally, the size of the vagina is about 7.5 cm from the opening to the cervix. The following factors affect the size of the vagina:
1. Under sexual stimulation, the vagina will "lengthen"
Under normal conditions, after the vagina is sexually stimulated, the vagina will be deformed and doubled in size. Sufficient foreplay can further expand the vaginal volume, which will also make the sexual experience continue to increase.
2. Different expansion of the anterior and posterior vaginal segments
In sexual life, when a woman is sexually excited, the outer 1/3 of the vagina of the genital organ shrinks, which acts as a tight grip on the penis to strengthen the stimulation of the penis; while the inner 2/3 of the vagina expands and stretches, which can be enough To accommodate the entry of the penis. The inner part of the vagina, which is about two-thirds the length of the vagina from the opening of the vagina, is much more sensitive than the front of the vagina.
3. Having a baby will make "her" 5 times bigger
Typically, the vagina is no more than one inch (2.5cm) in diameter. But before the baby is born, the vagina expands miraculously to 4 to 5 inches wide to allow the baby's head to pass through. But about six weeks after giving birth, the vagina returns (or almost does) to its previous, non-pregnant size.
4. After giving birth, the vagina has not changed much
Changes in the appearance and tissue of the vagina after childbirth are actually far less obvious than women understand. From the outside, very few people can tell from the outside whether a woman has given birth unless there is a tear during labor. Some women also feel that the vagina is sagging and flabby after giving birth. Lisa Lan suggests that such women can contract the pelvic floor muscles more, lasting a few seconds at a time, and repeating more than 10 times.
5. Factors Affecting Vaginal Size
Vaginal laxity - Repeated vaginal dilation after multiple natural deliveries can cause the vaginal walls to relax and cause vaginal enlargement. In addition, excessive sex life or promiscuity in women, repeated use of the vagina can also lead to vaginal relaxation.
