THE DEFEKENT DUCT 



1293 



and rectum are more intimately related. The vesicle tapers towards its inferior 

 end, which is placed close to the median plane and immediately above the prostate. 

 Inferiorly, the vesicle be- 

 comes constricted to form 

 a short duct, the ductus 

 excretorius, which joins the 

 lateral side of the corre- 

 sponding ductus deferens 

 at an acute angle to form 

 the ejaculatory duct. The 

 medial side of each vesicle 

 is related to the ductus 

 deferens, and the lateral 

 side, when the bladder is 

 empty, lies close to the 1J !MH ? ^ 



Pyv * -&E 



Ureter 



Internal urethral orifice 



Trigonum 



Ureter 



T Ductus deferens 



Rectum 



-f-a 



sloping pelvic floor. The 



seminal vesicle often 



assumes a more vertical 



position when the bladder is FIG. 



distended; a more horizontal 



direction when the bladder 



is empty. Its superior end 



is sometimes found to be curved backwards against the side of the rectum. 



KECTUM AND 

 THE URETERS 



ion. HORIZONTAL SECTION THROUGH THE 

 URINARY BLADDER AT THE LEVEL AT WHICH 

 PIERCE THE BLADDER WALL. 

 From a specimen in the Surgical Museum, Trinity College, Dublin. 



In 



Sphincter 

 an 



FIG. 1012. DISSECTION TO DISPLAY THE POSTERIOR ASPECT OF THE VESICUL.E SEMINALES, THE AMPULLA 

 OF THE DUCTUS DEFERENTES, AND THE PROSTATE. The coccyx and portions of the levatores ani 

 have been removed, also a considerable portion of the rectum. 



some cases the seminal vesicles are much smaller than usual, and may be less 

 than one inch in length. Frequently they are asymmetrical as regards size and 



