The vas deferens is a continuation of the cauda epididymis. It is about $40 \mathrm{~cm}$ long and enters the abdominal cavity through the inguinal canal.
Then, it passes over the urinary bladder, curves round the ureter and joins a duct from seminal vesicle and opens into urethra as the ejaculatory duct. These ducts store and transport the sperms from the testis to the outside through urethra.