8o ANATOMY OF THE RABBIT 



radial artery courses along the medioproximal third of the 

 radius, then along the ventral side to the base of the pollex, 

 thence, as the palmar arch, across the palm, giving off four pal- 

 mar interosii, which bifurcating send a branch to the adjacent 

 sides of each two digits, at a point about the middle of the second 

 ulnar metacarpal where it gives off the fourth palmar inter- 

 osseous a. which supplies the radial side of the fifth and ulnar 

 side of the fourth digits. The last important branch of the 

 radial artery is the princeps policis which passes over the base 

 of, and to the ulnar and dorsal sides of the pollex. 



12. Ulnar a. : Brachial, to flexor mm. and hand. Its general 

 course, for most of its length, is between the radius and ulna; 

 however, Bensley (p.. 218) found that it passes along the flexor 

 carpi ulnaris m. (29) to join the palmar arch on the volar side of 

 the fifth digit. The ulnar is small and seldom sufficiently well 

 injected to be followed to the hand. 



13. Radial recurrent a.: Radial; to proximal ends of 

 extensor communis digitorum m., extensor carpi radialis m. 

 and anastomoses freely with the brachial and radial branches, 

 but is sometimes very small. 



14. Ulnar recurrent a.: Ulnar, as in man; to flexor carpi 

 radialis, flexor profundus digitorum and other muscles. 



15. Volar interosseous a.: Base of ulnar; to interosseous 

 and carpal regions, passing along the caudal side of the inter- 

 osseous membrane. It is very small for its length. 



16. Nutrient a.: Base of ulnar; through nutrient foramen 

 into ulna, about three cm. from the semilunar notch. 



17. Palmar arch: Radial a.; to digits by four or five pal- 

 mar interosseous branches. This arch is formed mainly by the 

 radial, although the ulnar a. (12) and volar interosseous a. (15) 

 usually contributes to it. It gives off five interosseous branches 

 to the digits. 



