The ejaculatory duct is a short, muscular tube that is formed by the union of the vas deferens and seminal vesicle. It passes through the prostate gland and empties into the urethra. During ejaculation, the muscles in the wall of the ejaculatory duct contract, forcing semen into the urethra, where it is expelled from the body through the penis. The ejaculatory duct is an important component of the male reproductive system and plays a crucial role in the transport of spermatozoa during ejaculation.