160 



TOPOGRAPHICAL ANATOMY OF THE 



riattened band of fibres arising from the medial surface of the 

 sacro- spinous ligament close to the sciatic spine. Passing in a 



Aorta. 



Left ureter. 



Vena cava caudalis 



Nerve from caudal 

 mesenteric ganglion. 

 Internal iliac lymph glands. 

 N. genitofemoralis. 1 

 A. spermatica interna. '^ , 



Right ureter. \ 

 v. spermatica interna 

 A. circumflexa 



ilium profunda. 

 N. cutaneus 



femoris lateralis. ^\ 



Mesorectum. 



A. ha^morrhoidalis cranialis. 

 I 



Cut edge of peritoneum. 



N. spermaticus 

 internus 



M. obliquus internus abdominis. 



I 



M. cremaster externus. 1 i 

 A. epigastricus caudalis. ; 



Urogenital fold. 

 A. spermatica externa 



Left ductus deferens. 



'i Rectum. 

 Round ligament. 

 Middle umbilical fold. 



M. rectus abdominis. 



Urinary bladder. 



Fig. 70.— Dissection of tlie .structures about the entrance to the male pelvis, 

 dorsal direction it reache.s the root of the tail where it splits into 

 two layers, one passing on each side of the lateral ventral sacro- 

 coccygeal muscle. The insertion of the coccygeus is to the transverse 

 processes of the first three or four coccygeal vertebrae and the fascia of 

 the tail. 



