THE MALE PERINEUM. 



215 



finger and tearing it from the membranous portion of 

 the urethra. There is also danger of cutting the urethra 

 considerably anterior to the point indicated as the exact 



FIG. 37. 





w 



(The bulb is slightly raised and the rectum drawn backwards, in order to make 

 clear the membranous urethra and prostate, which are shown incised as in the 

 lateral operation of lithotomy.) 1. Bulb. 2. Rectum. 3. Gluteus maximus. 4. 

 External sphincter. 5. Levator ani, its anterior fibres raised to show the pros- 

 tate. 6. Erector penis. 7. Wilson's muscle. 8. Cowper's gland. 9. Trunk of 

 internal pudic. 10. Superficial perineal artery. 11. Artery to bulb (abnormal). 

 12. Artery to bulb. 13. Continuation of internal pudic artery. 14. Membranous 

 urethra divided as in the lateral incision. 15. Prostate gland, with its plexus of 

 vessels. 16. Incision in the prostate gland as in the latvral operation. 17. An- 

 terior layer of triangular ligament. 18. Transversus perinei muscle. (RICHET.) 



