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.
A dragon egg is an egg laid by a dragon as a means of reproduction of the species. Dragons have been known to lay eggs in a clutch of up to at least five. Whether an egg has to be fertilized by a male dragon in order to be fertile is not known. Dragons may have brooded their eggs.