218 SURGICAL ANATOMY OF 



of one portion belonging to the penis, and of another be- 

 longing to the perineum ; with the former is included 

 the spongy portions, and with the latter the membran- 

 ous and prostatie. 



Spongy Portion. Commencing from the orifice of the 

 urethra, a vertical slit provided with two lip-like mar- 

 gins, the urethral tube is seen at its most constricted 

 portion. On examining the floor of the canal within the 



FIG. 38. 



Longitudinal section of the bladder, prostate gland, and penis. 1. Urachus. 2. 

 Recto-vesical fold of peritoneum. 3. Opening of the right ureter. 4. A slight 

 ridge formed by the muscle of the ureter. 5. The neck of the bladder. 6. Pros- 

 tatie portion of the urethra. 7. Prostate gland.^ 8. The common ejaculatory 

 duct. 9. Right vesicula seminalis; the vas deferens is cut short. 10. Membran- 

 ous portion of the urethra. Its direction is the reverse of this when in situ. 11. 

 Cowper's gland of the right side, with its duct. 12. Bulbous portion of the 

 urethra. 13. Fossa navicularis. 14. Corpus cavernosum. 15. Right crus penis. 

 16. A portion of the septum pectiniforme. 17. The glans penis. 18. Corona 

 glandis. 19. Meatus urinarius. 20. Corpus spongiosum. 21. Bulb of the corpus 

 epongiosum. (WILSON.) 



meatus, a considerable dilatation is found, termed the 

 fossa navicularis, and on the roof of this part of the 

 urethra is the orifice of a large mucous pouch, the lacuna 

 magna. Behind this dilatation the canal averages about 



