140 



DISSECTION OF THE DOG 



i idialis 



a. ulnars 



-a. interossea volaris 



arcus volaris 

 profundus 



an. diyitales volar es c. 

 communes ~~""- : 



Fig. 54. — Diagram of the volar arteries of the nianus. 



dividing into a dorsal 

 and a volar branch. The 

 former assists in the form- 

 ation of the rete carpi 

 dorsale ; and the latter 

 is concerned in the pro- 

 duction of the deep volar 

 arch. 



A. ULNARis. — The ul- 

 nar artery is so much 

 larger than the radial that 

 it might be regarded as 

 the direct continuation of 

 the median. It follows 

 the median nerve along 

 the medial border of the 

 deep flexor, and crosses 

 the flexor aspect of the 

 carpus into the meta- 

 carpus between the super- 

 ficial and deep flexor 

 tendons. Just above the 

 carpus there is a slender 

 communication between 

 the ulnar and radial 

 arteries. In the meta- 

 carpus the ulnar artery 

 contributes a common 

 volar digital artery to the 

 first digit ; and then ends 

 about the middle of the 

 metacarpus by dividing 

 into common volar digitals 

 for the second, third, and 

 fourth digits (aa. digitales 

 volares communes II, 

 III, et IV). Each com- 

 mon artery is joined by 

 a communicating branch 

 from the dorsal common 

 digital artery, and then 

 divides at the end of 

 the metacarpus into two 



