Topography. 



85 



Glands 

 Cowperi 



Pars- 



ftie-m 



N. DORS. PENIS 



A., dors, penis 

 A. prvfi penis 



Corp. co 

 penis 



M. glutacus 

 magnus 



427. Topography of the Male Perinaeum. VI. 



View after removal of the M. levator ani. 



c) The MM. transversi perinei (see Fig. 425 and 426). The M. trans- 

 versus perinei superficialis arises from the ascending ramus of the ischium, 

 runs forwards and inwards, and unites with the corresponding muscle 

 of the other side, as well as with the Sphincter ani externus, the Accelerator 

 urinae and the Levator ani. The M. transversus perinei profundus (usually 

 described as the hindmost fibres of the Compressor urefhrae) lies above 

 the superficial, arises from the ascending ramus of the ischium and the 

 descending ramus of the pubes, and is united with the muscle of the 

 other side and the following. In it Cowper's glands are imbedded. 



d) The M. constrictor s. compressor urefhrae is a single muscle, which 

 arises from the descending ramus of the pubes together with the M. trans- 

 versus perinei profundus ; it surrounds the membranous portion of the urethra, 

 some of the fibres being in front of and others behind that portion. 

 The M. transversus perinei profundus and the M. constrictor urethrae form 

 together a broad, muscular plate, whose fibres cross each other in the 

 median line, the Centrum carneo-tendineum perinei s. Diapliragma urogenitale. 



