544 



THE ARTERIES 



longus pollicis. Opposite the metacarpo-i)halan(ieal joint it usually divides into 

 two branches, one of wliich is distributed to each side of the thumb on its palmar 

 aspect. These vessels anastomose with each other at the end of the thumb, like 

 the other collateral digital arteries. 



(2 ) The radialis indicis comes off from the radial artery a little lower than 

 the former vessel, or as a connnon trunk with it, and passes forwards between the 

 abductor indicis and adductor transversus pollicis, parallel to the radial side of the 



Fig. 359. — Axastomosep and Distribution of the Arteries of the Hand. 



Aiiltiior hilerosseotii' 



Radial nrturij 



Anterior radial carpal 



Stiper/icial lolar 

 Posterior radial carpjal 

 Radial artery at irrisl 



Dorsalis pollicis 



Metacaipal or 



first dorsal 



interosseous 



Princeps pollicis 



Dorsalis indicis 

 Radialis indicis 



First dorsal branch of collateral 

 digital 



Second dorsal branch of collateral 

 digital 



Anastomosis of collateral digital 

 arteries about matrix of nail 

 and pulp uf finger 



Ulnar artery 



Anterior ulnar 

 carpal 



Posterior ulnar 

 carpal 



Deep ulnar 

 Superficial arch 



Carpal recurrent 



Posterior communi- 

 cating or perforat- 

 ing 



Palmar interosseous 



Second, third, and 

 fourth palmar 

 digital 



Second and third 

 dorsal interosseous 



First palmar digital 



Anterior communi- 

 cating or perforat- 

 ing 



second metacarpal bone. After emerging from beneath the adductor transversus 

 j^ollicis, it continues its course along the radial side of the index finger, on its 

 palmar aspect, as far as the tip, anastomosing in this course with the collateral 

 digital artery on the opposite side of the finger in a way similar to that of the other 

 collateral digital arto^ries. It freiiuently communicates, at the lower l)order of the 

 adductor })ollicis, with the superficial palmar arch and ]>rinceps pollicis. It gives 

 off a dorsal branch, which anastomoses with the dorsalis indicis. 



(3) The palmar interosseous arteries, three in number, come off from the 



