The Male Reproductive Tract
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The urinary bladder (A) has been reflected caudally to show the two ductus deferens (B), after emerging from through the inguinal ring, course medially in the genital fold (which is a mesentary analogous to the mesometrium). They will enter the urethra after passing through the prostate gland (not seen here). The testicular artery and vein (C) can be seen coursing through the vaginal ring (D) with the ductus deferens. The ductus deferens, testicular artery and vein, as well as some nerves and lymphatics, are the elements of the spermatic cord. The vaginal ring is created by the parietal peritoneum as it decends with the testes. That portion of peritoneum that has decended with the testes becomes the vaginal tunic. The parietal vaginal tunic lines the scrotum, and the visceral vaginal tunic covers the testis and epididymis. Also seen here are the ureters (E) entering the neck of the urinary bladder. A triangle formed by the points where the two ureters enter the bladder and where the neck of the bladder becomes the urethra is known as the trigone of the bladder. Also labelled are the testes (F) and the descending colon (G).