MALE PERINEUM 



179 



Now that the inferior fascia of the diaphragm is removed 

 upon one side, the student can, with the point of the finger, 

 readily feel the staff as it lies within the membranous portion 

 of the urethra. He should examine the surroundings of 

 that canal. It is the shortest subdivision of the urethra, 

 and is about one inch distant from the symphysis pubis. 

 Throughout its entire extent it is enveloped by the fibres 

 of the sphincter muscle, and on that account it is sometimes 



Crus penis 



Internal pudendal arterj 



! 



Urogenital diaphraj 

 (interior fascia 

 Urogenital diaphragn 

 (superior fascia) 

 Prostate 



M. levator ani I 



Seminal vesicle 



Uuctus deferens 



ecto-vesical fasci; 



Rectal fasci. 



Rectun 



M. levator an 



M. ^lutaeus 

 maximus 



M. bulbocavernosus 



M. ischiocavernosus 



Urethra 



Inf. tascia of urog. dia. 

 Sup. trans, muscle 

 Coiles' fascia 



M sphincter ani 

 extemus 



FIG. 86. Dissection to expose the Prostate from the Perineum. 



called the muscular part of the urethra. On each side, and 

 at a lower level, is a bulbo-urethral (Cowper's) gland, whilst 

 between it and the symphysis pubis is the dorsal vein of 

 the penis, which is separated from it by the transverse liga- 

 ment of the pelvis. 



Vasa Lymphatica Perinei. The lymph vessels of the 

 perineum cannot be displayed in an ordinary dissection, but 

 they are present in great numbers, and the dissectors should 

 remember that the greater part of the lymph from the perineal 

 region is eventually discharged into the proximal group of 

 superficial subinguinal lymph glands which lie in the fat in 



TI 12 a 



