Sometimes, a small sample of tissue may be taken with small tools inserted through the vagina during a transvaginal ultrasound. In all three types of pelvic ultrasound, the transducer sends the reflected sound waves to a computer, which makes them into a picture that is shown on a video screen.
So the number of egg-containing follicles remaining in the ovary undergoes a steady decline from an average of 400,000 eggs at age eighteen to an average of 25,000 eggs by age thirty-seven. After age thirtyseven or thirty-eight, there is then a very dramatic acceleration of the monthly decline of remaining eggs.
Female Reproductive System. From the top of the uterus extend the fallopian tubes, which lead backward and downward to the ovaries. These are the two small sacs that contain the eggs. A woman is born with about 400,000 eggs. Each month during her reproductive years, usually only a single egg, or ovum, matures.The egg matures inside a follicle within an ovary. At midcycle, the egg is released from the follicle in a process called ovulation. The egg then enters and travels down one of the fallopian tubes toward the uterus.he egg matures inside a follicle within an ovary. At midcycle, the egg is released from the follicle in a process called ovulation. The egg then enters and travels down one of the fallopian tubes toward the uterus.