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The atrophied relic of the former is known as the paradidymis, that of the latter as the parovarium. Urogenital system of a human embryo of three inches in length, double natural size. h testicles, wg spermaducts, gh conducting ligament, p processus vaginalis, b bladder, au umbilical arteries, m mesorchium, d intestine, u ureter, n kidney, nn accessory kidney.
These are generally developed in one sex and rudimentary in the other. Thus the spermaducts are formed from the Wolffian ducts in the male, whereas in the female we have merely rudimentary traces of them in Gaertner's canals. Again, the male has in his nipples and mammary glands the rudiments of organs that are usually active only in the female.
But while in the male mammal the Wolffian ducts develop into the permanent spermaducts, there are only rudimentary relics left of the Mullerian ducts. The internal sexual organs of the mammals undergo very distinctive changes of position. In woman the ovaries travel more or less towards the small pelvis, or enter into it altogether.
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