PRACTICAL ANATOMY. 



7. Xame tlic structures tJiat meet at tlie central point of tJic perineum. 



The accelerator urinae and bulb. The external sphincter ani. The superfi- 

 cial trans versus perinaei. The rectum and labia majora. The triangular liga- 

 ment and labia majora. The fascia of Colles. The superficial perineal space. 



8. What is the importance of the fascia of Colles in extravasation of urine 

 through the bulb ? 



This fascia limits its extension laterally and posteriorly, since it is attached 

 both to the ischio-pubic ramus and lower part of the triangular ligament. 



9. Give the derivation of the superior layer of the triangular ligament. 

 It is a continuation of the obturator fascia. 



i o. Define the anal fascia. 



It is a division of the obturator fascia that covers the under surface of the 

 levator ani muscle. 



I I . Name the several modifications of the pelvic fascia. 



(i) Iliac ; (2) obturator ; (3) white line ; (4) Alcock's canal ; (5) anal fascia ; 

 (6) recto-vesical fascia ; (7) triangular ligament ; (8) pubo-prostatic ligament. 



EJAOULATORY DUCT 

 SINUS POCULARIS 



VERUMONTANUM 

 ORIFICE OF EJACULATORY DUCT 



AMPULLA OF VAS DEFERENS 



UNION OF VESICULA WITH VAS 



EJACULATORY DUCT ENTERING 

 PROSTATIC FISSURE 



PROSTATE 



MEMBRANOUS URETHRA - 



ORIFICE OF SINUS POCULARIS 

 LOWER END OF VERUMONTANUM 



VESICULA SEMINALIS 



FIG. 236. VASA DEKERENTIA AND VESKTI.V. SKMINUIS. (After Sappey.) 



The Base of the Bladder and Seminal Vesicles. Having thoroughly 

 studied the perineum and ischio-rectal fossa, make a dissection to show (i) the 

 membranous urethra, (2) the prostate gland, (3) the lower part of the rectum, 

 (4) the vesiculae seminales, (5) the base of the bladder, in the following manner 

 (turn to Fig. 229) : Cut the external sphincter ani and pull the rectum back- 

 ward and downward over the coccyx. This will put the levator ani on the 

 stretch. Now divide the levator ani near the white line its origin, as you will 

 remember. Now you will see in the mid-line (i) the membranous urethra, with 

 Cowper's gland on each side; (2) the prostate gland, receiving at its central part 

 the ejaculatory duct of the seminal vesicles ( l-'ig. 236); (3) the base of the bladder, 

 occupied by fatty conneetive tissue, in which you will find a remarkable plexus 



