the ejaculatory duct enters the urethra at the seminal colliculus.
the ejaculatory duct enters the urethra at the seminal colliculus.
where does the ejaculatory duct enter the urethra?
at the seminal colliculus
ejaculatory duct









































the ejaculatory ducts ("ductus ejaculatorii") are paired structures in male anatomy. each ejaculatory duct is formed by the union of the vas deferens with the duct of the seminal vesicle. they pass through the prostate, and open into the urethra at the seminal colliculus. during ejaculation, semen passes through the prostate gland, enters the urethra and exits the body via the urinary meatus.









































section::::function.









































section::::function.:ejaculation.
ejaculatory duct
attempts are sometimes made to diagnose an ejaculatory duct obstruction by means of medical imaging, e.g. transrectal ultrasound or mri, or by transrectal needle-aspiration of the seminal vesicles. however transrectal ultrasound has a relatively low sensitivity of approx. 50% and thus is only a tool to rule-out cysts in the region of the orifices but is not sufficient to rule out an obstruction of the ejaculatory ducts due to other causes. in approx. 50% of cases of unexplained low-volume azoospermia mri and trus do not reveal any pathological findings, because it is difficult to see alterations in a narrowed, scarred duct with these methods. due to the blockage of ejaculatory ducts, enlarged seminal vesicles are frequently seen in patients with ejaculatory duct obstructions. however, this is again neither a proof of an obstruction nor do normal-sized seminal vesicles rule-out an obstruction of the ejaculatory ducts. since ejaculatory duct obstruction is a relatively rare cause of infertility, this possibility may be unfamiliar to some physicians, even some urologists.
ejaculatory duct obstruction