The vasa deferns is a continuation of cauda epididymis which leaves the scrotal sac and enters abdominal cavity through inguinal canal.
It loops over the urinary bladder where it is joined by duct from seminal vesicles to form the ejaculatory duct.
They ONLY carry sperms from cauda epididymis to the ejaculatory duct.
Present in 2 in number in a human male, they are thick tubules from the vasa efferentia and its lining consitutes STEREOCILLIA.
It works like important bridge for sperm movement to ejaculatory duct, this makes vasa deferentia a important site for surgical population control method commonly called vasectomy i.e, cutting and tieing the vas deferentia.
Note: Fellow students do take a look at major differences between vasa efferentia and vasa deferens.