OF THE PERINEUM. 



371 



Transversus perinaei ; so that by the contraction of these muscles, which extend in 

 opposite directions, it serves as a fixed point of support. 



The Transversus perinaei is a narrow muscular slip, which passes more or less 

 transversely across the back part of the perineal space. It arises by a small tendon 

 from the inner and fore part of the tuberosity of the ischium, and, passing inward, 

 is inserted into the central tendinous point of the peringeum, joining in this situation 



RECTUS 



ABDOMINIS. 



Spermatic 

 cord. 



FIG. 224. The muscles attached to the front of the pelvis. (From a preparation in the Museum of the Royal 

 College of Surgeons of England.) 



with the muscle of the opposite side, the External sphincter ani behind, and the 

 Accelerator urinse in front. 



Nerve-supply. The perineal branch of the internal pudic. 



Actions. By their contraction they serve to fix the central tendinous point of 

 the peringeum. 



The Accelerator urinse (Ejaculator seminis, or Bulbo-cavernosus) is placed in 

 the middle line of the peringeum, immediately in front of the anus. It consists of 

 two symmetrical halves, united along the median line by a tendinous raphe. It 

 arises" from the central tendon of the perinseum, and from the median raphe' in 

 front, From this point its fibres diverge like the plumes of a pen ; the most 



