DISSECTION OF THE DOG 111 



umbilical artery (a. umbilicalis) very often arises from the visceral part of 

 the hypogastric artery instead of from the main trunk ; (2) the middle hcemor- 

 rhoidal artery (a. hsemorrhoidahs media) for the supply of the rectum and the 

 region of the anus ; (3) the perineal artery (a. perinei), a small branch ending 

 in the perineum ; (4) arteries to the penis : (a) the dorsal artery of the penis 

 (a. dorsalis penis) follows the dorsal vein and nerve along the dorsum of the 

 penis to the glans ; (6) the deep artery of the penis (a. profunda penis) enters 

 the corpus cavernosum penis ; (c) the artery of the urethral bulb (a. bulbi 

 urethrse)— the largest of the three— sinks into the corpus cavernosum urethra. 

 The parietal part (pars parietaHs) of the hypogastric artery is larger than 

 the visceral division of this vessel, and passes along the wall of the pelvis 



a. hypogastrica 



aa. lumbales 



Aorta, 



a mesenterica caudalis --" 



a. colica sinistra ''' 



a. hcemorrhoidalis 

 cranialis 



a. circumfiexa Uium' 

 profunda 



a. iliaca externa 



, a. sacTcUis medm 



I I 



' I a. iiiO'lum'baj.is 



a, glutcea cranialis 



a. caudalis lateralis 

 s-iifierficiau.'i 



a. glutcea cavdalis 



a. hcEmorrhoidahs media 



- a. perinei 



a. prufundu penis 

 a. hulbi urethT'je 

 a. diiTsaiis penis 



a. dfferehtialis ' 



a. vesicalis cranialis* i 

 a. umbilicalis 



^ a. pudenda interna 



a. profunda feTTioris 

 a. pudenda externa 



a. epigastrica caudalis 

 Frn. 42. — Diagram of the external iliac and hypogastric arteries. 



at a more dorsal level. Crossing first the medial face of the ilium and then 

 the medial face of the piriformis and superficial gluteal muscles, it ends as 

 the caudal gluteal artery previously examined in connection with the other 

 deep gluteal structures. 



The vessels arising from the parietal part of the hypogastric artery are 

 the following : (1) The ilio-lumbar artery (a. ilio-lumbalis) arises close to the 

 origin of the pars parietahs, or even from the main stem of the hj^ogastric 

 artery itself, and is expended in the psoas minor, ilio-psoas, sartorius, tensor 

 fascise latse and middle gluteal muscles ; (2) arising at the oral border of the 

 piriformis muscle, th.e cranial gluteal artery (a. glutsea cranialis) passes into 

 the gluteal region along with the sciatic nerve ; (3) branches are contributed 

 to the internal obturator, levator ani, coccygeus and piriformis muscles 

 (ranod musculares) ; (4) the superficial lateral caudal artery (a. caudahs lateralis 



