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.
Human eggs: How many and for how long? How many eggs does a woman have when she is born? Does a woman still have eggs when she starts menopause? Unlike sperm, which are produced daily throughout a lifetime, human eggs are finite and found in one â okay, two baskets (ovaries).