1108 UROGENITAL SYSTEM. 
usually be seen shining. In the pelvic part of its course the vas deferens crosses 
on the inner side of (1) the obliterated hypogastric artery, (2) the obturator nerve 
and vessels, (3) the vesical vessels, and (4) the ureter (Fig. 753). 
Vesical artery First sacral vertebra 
External iliae vessels \ | 
Obturator nerve — > Ay ANY ret Position of internal iliac 
Obliterated hypogastric \ ; artery. 
artery 
Vas deferens 
i 
Ureter 
Ridge due to 
nerve fibres 
trom hypo- 
gastric 
plexus 
Plica ) }| 
wnbilicalis -! 
lateralis ) 
Obturator 41 
vessels J | | 
Paravesical | 
fossa f 
Plica )| | 
vesicalis =; 
transversa } 
Vas deferens 
| 
| Recto- 
UW vesical 
pouch 
Symphysis 
pubis 
| 
| 
Opening of ureter into bladder | 
Portions of vasa deferentia cut in section 
Prostate 
Rectum 
Fic. 753.—MeEstaL SECTION OF AN ADULT MALE PELVIs. 
The coils of the small intestine which lay within the pelvis have been lifted out in order to give a view of the 
side wall of the pelvic cavity. The peritoneum is coloured blue. The separation of the bladder from 
the prostate is indicated somewhat diagrammatically. 
Beyond the ureter the vas takes a somewhat sudden bend, and passes down- 
wards and inwards towards the middle line, beneath the peritoneum of the pelvic 
floor. Reaching the interval 
between the base of the 
bladder in front and the 
ee _.. rectum behind, the vasa de- ~ 
“Sy, Internal urethral orifice : 5 6 j 
a Trigonum vesice ferentia of opposite sides : 
ree Ureter occupy the angle formed — 
Geta See between the vesiculee seml- — 
, nales (Fig. 755). “As they 
approach one another each — 
vas becomes somewhat tor- 
tuous, sacculated, and dilated, 
and assumes a general re- 
semblance in structure to a 
portion of the vesicula semi- 
nalis. To this dilated part 
of the vas deferens the term 
Fic, 754. — HoriwontaL Secrion THROUGH THE Rectum anp ampulla (ampulla ductus de- 
BLADDER AT THE LEVEL AT WHICH THE URETERS PIERCE THE ferentis) is applied. As it 
BLADDER WALL. : F 2 
turns inwards the vas lies a 
short distance behind the 
ureter, and immediately in front of the edge of the peritoneal fold sometimes — 
known as the posterior false ligament of the bladder. Just above the base of — 
Vesicula 
seminalis 
Reetum 
i 
From a specimen in the Museum, Trinity College, Dublin. 
