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The anterior cavity receives the urogenital canal, and is the sole outlet of the urine and the sexual products; the hind or anus-cavity passes the excrements only. Even before this partition has been formed in the Marsupials and Placentals, we see the first trace of the external sexual organs.
Think of the effect of continual conversation and thinking of this sort upon a child at or before puberty, or at adolescence, or even upon an individual in adult life! His thoughts are continually drifted to his urogenital organs and the sexual possibilities of all sorts of human relationships, intrafamilial as well as extrafamilial.
Man has faithfully preserved the main features of his stem-history in the ontogeny of his urinary and sexual organs. All the peculiarities of urogenital structure that distinguish the mammals from the rest of the Vertebrates are found in man; and in all special structural features he resembles the apes, particularly the anthropoid apes.
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.
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