The vas deferens is divided into four parts: testis, spermatic cord, inguinal canal and pelvis. 1. Testicular division: it refers to the short section that runs along the posterior edge of the testis in a tortuous upward direction, which is the beginning of the vas deferens. 2. Spermathecal division: It is located between the head of the epididymis and the inguinal subcutaneous ring, mostly on the posterior medial side of the spermatic cord, and is easily palpable through the scrotal wall. 3. Inguinal canal: the section from the superficial ring to the deep ring of the inguinal canal. 4. Pelvic division: from the deep ring of the inguinal canal to the pelvis, from the lateral side around the beginning of the inferior abdominal wall artery along the lateral pelvic wall down the posterior side, and then turn inward, across the end of the ureter medial, between the bladder and rectum to the base of the bladder. The vas deferens are a pair of elongated tubes, one on the right and one on the left, each about 40 centimeters in total length. One end of the vas deferens is connected to the epididymal ducts, and the other end joins the ducts of the seminal vesicle glands to form the ejaculatory ducts, which open into the posterior urethra.