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MUSCLES OP THE PERINEUM. 197 



dent dissect off the integument carefully from the whole of the included 

 space, and he will expose the fatty cellular structure of the common 

 superficial fascia, which exactly resembles the superficial fascia in 

 every other situation. The common superficial fascia is then to be 

 removed to the same extent, exposing the superficial perineal fascia. 

 This layer is also to be turned aside, when the muscles of the genital 

 region of the perineum will be brought into view. 



The Jlcceleratores urince arise from a tendinous point in the centre 

 of the perineum and from the raphe. From these origins the fibres 

 diverge, like the plumes of a pen ; the posterior fibres to be inserted 

 into the ramus of the pubis and ischium ; the middle to encircle the 

 corpus spongiosum, and meet upon its upper side ; and the anterior 

 to spread out upon the corpus cavernosum on each side, and be 

 inserted, partly into its fibrous structure, and partly into the fascia 

 of the penis. The posterior and middle insertions of these muscles 

 are best seen, by carefully raising one muscle from the corpus spon- 

 giosum and tracing its fibres. 



Relations. By their superficial surface with the superficial peri- 

 neal fascia, the dartos, the superficial vessels and nerves of the peri- 

 neum, and on each side with the erector penis. By their deep sur- 

 face with the corpus spongiosum and bulb of the urethra. 



The Erector penis arises from the ramus and tuberosity of the 

 ischium, and curves around the root of the penis, to be inserted into 

 the upper surface of the corpus cavernosum, where it is continuous 

 with a strong fascia which covers the dorsum of the organ, the 

 fascia penis. 



Relations. By its superficial surface with the superficial perineal 

 fascia, the dartos, and the superficial perineal vessels and nerve. By 

 its deep surface with the corpus cavernosum penis. 



The Transversus perinei arises from the tuberosity of the ischium 

 on each side, and is inserted into the central tendinous point of the 

 perineum.* 



Relations. By its superficial surface with the superficial perineal 

 fascia, and superficial perineal artery. By its deep surface with 

 the deep perineal fascia, and internal pudic artery and veins. By its 

 posterior border it is in relation with that portion of the superficial 

 perineal fascia which passes back to become continuous with the 

 deep fascia. 



To dissect the compressor urethra, the whole of the preceding 

 muscles should be removed, so as to render the glistening surface 

 of the deep perineal fascia quite apparent. The anterior layer of 

 this fascia should then be carefully dissected away, and the corpus 

 spongiosum penis divided through its middle, separated from the 



* I once dissected a perineum in which the transversus perinei was of large size, and 

 spread out as it approached the middle line so as to become fan-shaped. The posterior 

 fibres were continuous with those of the muscle of the opposite side ; but the anterior 

 were continued forwards upon the bulb and corpus spongiosum of the urethra as far as 

 the middle of the penis, forming a broad layer whieh usurped the place and office of the 

 accelerator urinae. 



