The two ejaculatory ducts are each <1 in. (2.5 cm) long and are formed by the union of the vas deferens and the duct of the seminal vesicle.
The ejaculatory ducts pierce the posterior surface of the prostate and open into the prostatic part of the urethra, close to the margins of the prostatic utricle;
The function of these ducts is to drain the seminal fluid into the prostatic urethra.