1064 



URIXA R Y AND REPR OD VCTl \ T OR GAXS 



fascia, at tlie anterior border of tlie levator ani; while behind it extends backwards 

 for a variable distance to join again with the obturator fascia. In this way the two 

 fasciae, obturator and ischio-rectal, close in the ischio-rectal fossa above, in front, 

 and l)ehind, but leave it widely open below. 



Fig. 652. — Sagittal Section through the Perix.t;ai. Ledge and Ischiorectal Fossa 

 TO the Left of the Middle Line. (Diagrammatic.) (W. A.) 



PyriformiB 



Obturator fascia 



Subperitoneal tissue — 

 Fascia trausversalis 



OS PUBIS 

 Obturator internua 



Fascia lata of thigh 

 Muscles of tliigti 



KER VES 



Great sacro-sciatio 



ligament 



Lesser saero-sciatic 



ligament 



Gluteus mazimus 



Levator ani with its 

 fasciae 



Ischio-rectal fossa 



Deep periuaeal interspace 

 with deep transversus 

 perinael 



Superficial triangular 

 ligament 



perfleial periuaeal interspace 

 with muscles of penis 



The ischio-rectal fossae (figs. 647, 648, 652, 653) are two deep interspaces, 

 one on each side, left by the divergence of the obliquely directed muscles of the 

 pelvic floor (levator ani and coccygeus) from the vertical pelvic wall. Each fossa 



Fig. 653. 



-Section showing the Ischiorectal Fossa in its Eelations to the 

 Pelvic Viscera. (W. A.) 



OS PUBIS 

 Muscles 



Levator ani with reeto-vesical 

 and ischio-rectal fasciae 



Obturator internus 



Internal pudic vessels and 

 NER VES in obturator fa.icin 

 TUBER ISCHIl 

 Ischio-rectal fossa with its 

 anterior and posterior ex- 

 tensions 



Gluteus maximus 



-SYMPHYSIS PUBIS 



Pubo-prostatie ligaments 



Prostatic plexus 

 PROSTATE 



Capsule of prostate formed 



by reeto-vesical fascia 

 Fat 



RECTUM INVESTED BY RECTO- 

 VESICAL FASCIA 



is bounded externally by the obturator internus below the level of the white line, 

 the corresponding portion of the obturator fascia (with Alcock's canal and the 

 pudic vessels and nerves), and the os innoniinatuni; and internally hj the levator 

 ani and coccygeus and the ischio-rectal fascia. Superiorly, the vertical outer wall 



