ABDOMEN AND PELVIS 



437 



two distinct layers. The fascia in this region is spoken of occa- 

 sionally as the " inferior perineal aponeurosis." The inferior 

 layer is continuous with all the neighboring superficial fascia, 

 while the superior layer is dense and membranous. It is called 

 Colles' fascia; it gains smooth muscular fibres anteriorly to 

 form the tunica dartos of the scrotum. It is the continuation 

 of Scarpa 's fascia of the abdomen into the perineum. 



...Fascia superficialis 

 Testis 



-A. pudendus externus 

 tH v. perinei 



A. perinei superflcialis 



Fasc. superf. perinei 



(deep layer) 

 A. perinei 



~..M. trans, perinei superf. 



'-Central tendinous point 

 M. levator ani 



" M. sph. ext. (anococcygeal 



layer) 

 M. sph. ext. (external layer) 



Fascia superficialis perinei. ( From Poirier et Charpy, Traite d'Anat. hum., Paris, 1901 , t. ii. p. 215, 



Fig. 143.) 



To demonstrate the attachments of this deep layer proceed 

 as follows: Enter the knife in the median line at the base of 

 the scrotum and carry it dorsalward and lateralward to the 

 tuber ischiadicum on each side, exercising caution to avoid 

 injury to important vessels and nerves just below this fascia. 

 Carefully dissect back the central and the two lateral flaps, 

 noting the attachment of the fascia. How is it related to the 

 muscles immediately beneath? 



After studying this fascia fully, proceed to the study of 

 the contents of the ' ' inferior perineal compartment. ' ' 



Structures in " Inferior Compartment" of Perineum between the Fas- 

 cia Superficialis Perinei and the Diaphragma Urogenitale. 



Muscles of the Perineum (Musculi perinei). (See Figs. 223 and 224.) 



These muscles are all attached to the organs of copulation and 



