The seminal vesicles are about 2 inches (5 cm) in length, are 2 coiled sacculated tubes which can be untangled to 3 times of its length. Their location is at the base of the urinary bladder, lateral to the end point of the vas deferens and in front of the rectum. The ejaculatory duct is created by the joining of the ductus deferens to the lower end of the seminal vesicle (duct of the seminal vesicle).
Another important fact is that the seminal vesicles, as also their name suggests, don’t create a reservoir for sperms. A large amount of the seminal fluid is created through its secretions. The secretion of seminal vesicles is somewhat alkaline, consisting of fructose, choline, and a coagulating enzyme named vesiculose.
The secretion of seminal vesicle includes fructose, that is not created anywhere else within the body. This gives a forensic evidence of the incidence of rape. Nevertheless, choline crystals supply the preferable foundation for determination of the presence of seminal fluid (Florence test).