Pelvic part of ductus deferens

After his inguinal part, the ductus deferens is next directed backward and slightly downward, and, crossing the external iliac vessels obliquely, enters the pelvic cavity (Pelvic part of the ductus deferens), where it lies between the peritoneal membrane and the lateral wall of the pelvis, and descends on the medial side of the obliterated umbilical artery and the obturator nerve and vessels.

It then crosses in front of the ureter, and, reaching the medial side of this tube, bends to form an acute angle, and runs medialward and slightly forward between the fundus of the bladder and the upper end of the seminal vesicle.

Reaching the medial side of the seminal vesicle, it is directed downward and medialward in contact with it, gradually approaching the opposite ductus. Here it lies between the fundus of the bladder and the rectum, where it is enclosed, together with the seminal vesicle, in a sheath derived from the rectovesical portion of the fascia endopelvina.

Lastly, it is directed downward to the base of the prostate, where it becomes greatly narrowed, and is joined at an acute angle by the duct of the seminal vesicle to form the ejaculatory duct, which traverses the prostate behind its middle lobe and opens into the prostatic portion of the urethra, close to the orifice of the prostatic utricle.

The ductus deferens presents a hard and cord-like sensation to the fingers, and is of cylindrical form; its walls are dense, and its canal is extremely small.