JAB4119222: Ejaculatory system 1866 illustrations showing details of the organs involved in the production of semen Fig 1: the seminal vesicles (oval, left and right), vas deferens (tubes, top) and ejaculatory duct (small oval hole, lower centre) Fig 2: cross-section through one of the vas deferens (tube, left) and seminal vesicles (oval, right through) Fig 3: cross-section showing the internal surface of one of the vas deferens The seminal vesicles secrete a significant proportion of the fluid that ultimately becomes semen The vas deferens transport sperm from the epididymis of the testes to the ejaculatory ducts in anticipation of ejaculation The two ejaculatory ducts are formed by the union of the vas deferens with the duct of the seminal vesicles Canal deferent, seminal vesicle, injecting ejaculating canal - Fig 1: Canal deferent, seminal vesicle and ejaculating canal, Fig 2: Cutting of channel and vesicle, Fig 3: Internal surface of channel deferent - 1866 / Bridgeman Images