Arteria radialis et ulnaris. 



213 



Ten&o 

 M.ext.carp.uln. 



Tendo 

 M. ext. dig: 



.ext. oss. 

 metac.poll. 



S. dorsoL. 

 A. radial. 



A.inteross. 

 vs. I. 



Tetido 



M.ext.primi 

 intern.poll. 



L4L aigi 

 dorsal. 



559. The Arteries at the Back of the Hand. 



The superficial palmar arch, Arcus volaris sublimis (see Fig. 557) 

 has its convexity directed towards the fingers ; it is the continuation of 

 the ulnar artery, and is sometimes completed by inosculating with the 

 superficialis volae branch of the radial. From its convexity three digi- 

 tal branches, Arteriae digitales volares communes, are given off, each of 

 which divides into two, the Arteriae digitales volares propriae, to supply 

 the contiguous surfaces of the second, third, fourth and fifth fingers, 

 down to the tip ; a fourth branch supplies the ulnar side of the little finger. 



The deep palmar arch, Arcus volaris profundus (see Fig. 558), 

 the smaller and less convex, is formed principally by the radial artery. 

 It gives off three palmar inter osseous branches, Arteriae inter- 

 osseae volares, which lie in front of the interosseous spaces of the four 

 fingers, send off perforating branches, Rami interossei perforantes, 

 to the dorsum of the hand and inosculate with the digital branches 

 from the superficial arch. 



From the posterior carpal arch, Bete carpi dorsale, only three 

 interosseous arteries, Arteriae interosseae dorsales, are given off, 

 the first arising directly from the radial artery; this latter divides 

 into three branches, the others only into two ; these are called d o r- 

 sal digital arteries, Arteriae digitales dorsales, and pass down as far 

 as the second phalanges. 



28* 



