30-year-old woman's vagina

The vagina is the female's mating organ and an important channel for menstruation and fetal delivery. The vagina is the female's reproductive system and is very important for girls. The inner wall of the vagina has a layer of mucous membrane with many wrinkles. Due to different degrees of contraction, it can moisturize and protect. The vagina has different structures, and each person's vagina is different. Some people are petal-shaped, and others are wrapped.

The vagina is the female's organ of reproduction and is also the channel for menstruation and childbirth. The inner wall of the vagina has a layer of mucous membrane, which has many folds and therefore has a lot of room for expansion and contraction. During sexual impulses, the fluid secreted by the mucous membrane can lubricate the vagina and penis.

Characteristics of the uterus. The uterus is located in the pelvic cavity in an inverted pear shape, and the surrounding ligaments fix it in the pelvic cavity. The uterus is divided into three parts: the body, the fundus and the cervix. From puberty to menopause, the regulation of female hormones in a woman's endometrium undergoes cyclical changes, making it receptive to the implantation of a fertilized egg at a certain time of each month. The uterus is also the breeding ground for the fetus. The capacity of the uterus does not exceed 10 ml when not pregnant, and can reach 4000 ml at full-term pregnancy; the weight of the uterus also increases from about 50 grams to about 1000 grams to meet the needs of nurturing the fetus.

Function of the ovaries. The ovaries are located on both sides of the uterus, behind and below the fallopian tubes, one on each side. The ovaries are oval in shape and are fixed in the pelvic cavity by ligaments. The ovaries discharge eggs and secrete female hormones. Female hormones maintain women's secondary sexual characteristics, such as breast bulge, subcutaneous fat accumulation, and shrill voice; they also maintain women's sexual function, and they act on the whole body through blood circulation. From puberty to menopause, that is, from around 13 to 49 years old, women release a mature egg every month.

Egg channel. After the mature egg is released from the ovary, it is transported into the fallopian tube from the abdominal cavity through the fimbria of the fallopian tube. The fallopian tubes are located on both sides of the uterus, and the mucous membrane of their inner walls is completely covered with vibrating cilia. After the egg enters the fallopian tube, it gradually moves toward the uterus with the help of the peristalsis of the fallopian tube and the movement of cilia. At this time, if it encounters sperm, it will combine to become a fertilized egg, which will continue to divide and develop while moving toward the uterus, and then enter the uterine cavity and implant. If the egg is not fertilized, it will die on its own after entering the uterine cavity.