ABDOMEN AND PELVIS 



443 



(fee) The third lamella covers the deep transverse muscle of the 

 perineum superiorly. It extends from the urethra in the 

 median line to the line extending between the tuber ischiadi- 

 cum of each side posteriorly. The anterior border is inti- 

 mately adherent to the urethra, while the posterior gives 

 off processes which are united to the inferior aponeurosis 

 of the levator ani muscle. It is also intimately adherent to 

 the central tendinous point of the perineum. 



Duct. def._. 

 Allantoic shea 

 M. obturat. int.r_' . 

 M. lev. ani 2 



FIG. 229. 



Umbilico-vesical apon. 

 Fascia obturatoria 

 Arcus tend. M. lev. ani 



^Fasc. M. lev. ani 

 Memb. obturat. 



Apon. pubo-prost. 

 .Prostate 



Inf. pelvi-rectal space 

 M. trans, perinei prof. 

 -Fasc. diaph. urogen. inf. 

 Fasc. superflc. perinei (deep 



layer ; Colics' fascia) 

 Fasc. diaph. urogen. inf. (layer 



passing under the bulb) 

 Fasc. supertic. perinei 



The fasciae of the pelvic floor and of the perineum. Frontal section through the bulbus urethrae. 

 (From Poirier et Charpy, Traite" d'Anat. hum., Paris, 1901, t. v., fasc. 1, p. 218, Fig. 147.) 



Kemove the inferior fascia of the urogenital diaphragm 

 (fascia diaphragmatis urogenitalis inferior) on one side and 

 note the contents of the " middle perineal compartment ' ' (0. T. 

 space between the two layers of triangular ligament). 



Muscles. (Vide Figs. 226 and 229, and Spalteholz, Fig. 673.) 



(a) Deep transverse muscle of perineum (M. transversus perinei pro- 



fundus). What is the general direction of the fibres composing 

 this muscle? What is the relation to the perineal body? (Vide 

 Poirier et Charpy, t. v. p. 202.) 



(b) Sphincter muscle of the membranous urethra (M. sphincter 



urethrae membranaceae) . It is also known as the "striated 

 sphincter of the urethra." Consult Poirier et Charpy, t. v. p. 

 204, concerning the disposition of the fibres forming this muscle. 

 Arteries. (Vide Fig. 224, and Spalteholz, Fig. 473.) 

 (a) Artery of the penis (A. penis). 



(aa) Artery of bulb of urethra (A bulbi urethrae). 



(ab) Urethral artery (A. urethralis). 



(ac) Deep artery of penis (A. profunda penis). 



(ad) Dorsal artery of penis (A. dorsalis penis). 



Determine the exact relation of each artery. Dissect out the veins 

 accompanying each, carefully noting relations and anastomoses. What 

 is the course of the dorsal vein of the penis (V. dorsalis penis), and into 

 what does it empty? 



