PLATE LX. 



THE THIRD VIEW OF THE PERINEUM-PROSTATE 

 AND VESICUIJE SEMINALES. 



In this view of the perineum the accelerator iiriii:i- 1ms been divided alon ' 

 central raphi and turned aside to expose the bulbous portion of the corpus spoii'_cioMim. 

 The levator ani has been severed behind the central fixed point of the perineum, and 

 tin rectum pulled back to expose the prostate and base of bladder, with the vesicula? 

 seminales. The anterior layer of the triangular ligament was removed on the left side, 

 to show the internal pudic artery and dorsal nerve of the penis. 



The following structures are contained between the two layers of the triangulai 

 ligament : 



1. Dorsal nerve of penis, and twig to the bull). 



2. Internal pudic arteries, and arteries to the bulb. 

 8. Plexus of veins. 



4. Deep transverse muscle. 



5. Cowper's glands. 



6. Membranous urethra. 



7. Compressor uretline. 



8. Dorsal vein of penis. 

 !. Snbpubic ligament. 



Thus, in the dissection of the perineum the following alternating layers have been 

 seen and divided : 



1. Fascia of Colles, or deep layer of the superficial fascia. 



(Erector penis. 

 Accelerator urinse. 

 Transversus periuei. 



3. Anterior layer of triangular ligament. 



4. Compressor urethra and deep transversus muscle. 



5. Posterior layer of the triangular ligament. 

 C. Levator ani. 



7. Capsule of prostate. 



