THE PERiy.EUM PRO PER 



1007 



muscle. IXispicrcedhy: — (1) Tlie urethra, aliout an inch and a (juarter Ixldw 

 the symphysis; (2) the ducts of CowiDer's ghmds, one on each side of the posterior 

 ])art of the urethral openings; (3) the arteries of the hulh, somewhat external to 

 the last; (4) the arteries to the corpora cavernosa, more anteriorly and close to tlie 

 lateral attachment of the ligament; (5) the dorsal arteries and nerves of the penis, 

 at the margins of the ligament near its apex. The dorsal vein with some accom- 

 panying lymphatics runs through the interspace between the triangular and subpubic 

 ligaments (fig. 654). 



Deep pehnaeal interspace (figs. 620, 652, 654). — If the superficial triangular 

 ligament be now detached, the deep perinreal interspace will be laid open. This 

 space is somewhat wedge-shaped in sagittal section, in consequence of the manner 

 in which the two triangular ligaments approach each other before their union 

 at the posterior border of the perinieal ledge. It is occupied by the following 

 structures : — 



(1) The membranous urethra, surrounded by its annular sphincter of smooth 

 muscular fibres. 



(2) Cowper's glands, seen as two white pea-like bodies, one on each side of 

 the posterior segment of the urethra. Their ducts pierce the superficial ligament. 



Fig. 655. — Vertical Frontal Section of the Pelvis, showing Fasci.e. 

 (Modified from Braane.) 



UVUU VESICA 



PROSTATE 

 VERUMONTANUM 



Levator ani 



MEMBRANOUS URETHRA 



Pmlic vessels 



PUBIC ARCH 



Fascia of ischio- 



BULBO-CAVERNOSUS 



WITH ITS FASCIA 



Inteeument of 



perinsEum 



Subperitoneal fat 



Obturator internus 

 Isehio-reetal fascia 



OS NNOV^I^ATUM 

 Recto-vesical fascia, 

 parietal and visce- 

 ral layers 

 Obturator fascia 

 Obturator mem- 

 brane 

 ISCHO-RECTAL FOSSA 



'i^ Deep triangular lig. 



Deep transversus 



perinaei 

 Superficial triangu- 

 lar ligament 



Muscles of thigh 



Ischio-cavernosus 



Muscles of thigh 



(3) The internal pudic arteries, lying close to the ischio-pubic rami imbedded 

 in the fibres of origin of the compressor urethrse muscle, giving off each an artery 

 to the bulb as well as some twigs to Cowper's gland and to the muscular tissue 

 surrounding the urethra, and terminating by division into the artery of the corpus 

 cavernosum, and the dorsal artery of the penis. These branches with the associated 

 veins have been seen to pass through the superficial triangular ligament intt^ the 

 superficial perinjeal interspace. 



(4) The pudic veins, accompanying the arteries. Their tributaries form a 

 plexus around the urethra, and in the substance of the fibres of the deep trans- 

 versus perina-i. This plexus, which is often largely developed in old persons, 

 receives the veins of the corpus spongiosum and corpora cavernosa, and commu- 

 nicates freely with the dorsal vein of the penis, and through this with the prostatic 

 plexus. 



(5) The pudic lymphatics, accompanying the veins and terminating in the 

 pelvic glands. 



(6) The dorsal nerves of the penis, the terminal branches of the internal 



