DISSECTION OF THE DOG 



139 



sor digiti quinti towards 

 the carpus, where it 

 assists the proximal col- 

 lateral radial artery and 

 the radial artery in the 

 formation of the rete 



carpi i 



The volar interosseous 

 artery (a. interossea vola- 

 ris) is much larger than 

 the dorsal artery of the 

 same name, and follows 

 the interosseous space 

 under cover of the pro- 

 nator quadratus muscle. 

 Just above the carpus a 

 moderately large branch 

 is contributed to the rete 

 carpi dorsale. In the re- 

 gion of the carpus the 

 artery comes into rela- 

 tionship with the ulnar 

 nerve, and medial to the 

 pisiform bone it contri- 

 butes a superficial branch 

 which runs along the fifth 

 digit. The continuation 

 of the artery sinks into 

 the deeper structures and 

 will be followed later as 

 the main contributor to 

 the deep volar arch (areus 

 volaris profundus). 



A. radialis. — The 

 radial artery is much the 

 smaller of the two ter- 

 minal branches of the 

 median. Following first 

 the radial head of the 

 deep flexor and then 

 the medial border of the 

 radius, it terminates just 

 proximal to the carpus by 



. interossea 



dorsalis 



a. collateralis radialis 

 '■ proTimalis. Ramus 

 lateralis 



--a. radialis 



aa. metacarpeee 

 dorsales. *"«; 



aa. digitales dorsales 

 communes 



Fiq. 53. — Diagram of the arteries on the dorsum of the manus. 



