160 



TOPOGRAPHICAL ANATOMY OF THE 



flattened band of fibres arising from the medial surface of the 

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



Aorta. 



Vena cava caudalis 



Nerve from caudal j 



mesenteric ganglion. , 



Internal iliac lymph glands. 



N. genitofemoralis. i 



A. spermatica interna. \ i 



Left ureter. 

 I 



Mesorectum. 



I ! 



A. hsemorrhoidalis cranialis. 



peritoneum. 



v. spermat 

 A. circum' 

 ilii: 

 N. cutaneus 

 fcBioris 



N. spermaticus 

 interniis 



Left ductus deferens. 



Rectum. 

 I Round ligament. 

 Middle umbilical fold. 



M. obliquus internus abdominis. 



M. cremaster externus. i i i ', 



A. epigastricus caudalis. | ' ', 



LJrogenital fold. ' i 



A. spermatica externa. ' 



M. rectus abdominis. ', 



LTrinary bladder. 



Fig. 70. — Dissection of the structnre.s about the entrance to the male pelvis. 

 dorsal direction it reaches 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. 



