354 ABDOMEN 



The bulb and the two crura together constitute the root of 

 the penis, and each is provided with a special muscle, which 

 at present hides it from view. Clothing the bulb the student 

 will recognise a bipenniform muscle called the bulbo-cavernosus, 

 whilst moulded upon the surface of each crus is the ischio- 

 cavernosus. These muscles should now be cleaned and their 

 connections examined. 



Corpus cavernosum penis 



Cms penis : surface at- 

 tached to the pubic arch 



Urethra (divided) 



Bulb of corpus cavernosum 

 urathrae 



Fascia covering bulb divided where 

 it is continuous with the urogenital 

 diaphragm 



FIG. 133. Dorsal or attached aspect of the Penis. The specimen was 

 hardened by formalin injection and removed from the pubic arch and the 

 triangular ligament. 



Superficial Perineal Muscles. Under this heading are 

 included not only the bulbo-cavernosus and ischio-cavernosus 

 muscles, but also the superficial transverse perineal muscles. 

 The superficial perineal muscles have been seen to lie within 

 the pouch formed by the superficial fascia and the urogenital 

 diaphragm. When the superficial fascia is removed each will 

 be found to be invested by its own delicate aponeurotic 

 layer. 



M. Transversus Perinei Superficialis. This is a narrow 

 slip of muscular fibres which arises from the medial aspect 



