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Other Terms: Vas deferens, Ductus deferens, Conduit déférent
The vas deferens (ductus deferens), the duct of the testis, is the continuation of the epididymis, and extends from the globus minor to the prostatic urethra. It passes upward in the spermatic cord and enters the abdominal cavity through the internal abdominal (abdominal inguinal) ring, where it lies to the lateral side of the deep epigastric artery. It runs in the extraperitoneal fat anterior and medial to the external iliac vessels and obliterated umbilical artery, and passes into the penis to the side of the bladder. It runs between the bladder and the ureter, and along the medial side of the seminal vesicle between the base of the bladder and the rectum as a dilated tube, or ampulla, which contains pouches or sacculi. Opposite the base of the prostate, it abruptly becomes narrow and joins the open end of the seminal vesicle to form the ejaculatory duct. The vas deferens is about sixty centimeters (twenty-four inches) long, fifteen centimeters (six inches) being situated in the spermatic cord and along the epididymis, and the balance in the general abdominal cavity. The vas deferens may be divided into four portions: the testicular portion, extending a long the epididymis from the globus minor to the top of the testicle; the funicular portion, extending from the latter point to the external abdominal ring; the inguinal portion, occupying the inguinal canal, and the pelvic portion, extending from the internal abdominal ring to the termination at the ejaculatory duct.