Arteries of the Arm. 



417 



Radius 

 A. radialis 

 Ramus earpeus volaris 



Branch of the a. interossea volaris 



Ulna 



- . A. ulnaris 



Ramus rolaris superflcialis 



51. opponens pollicis 



Areus volaris profundus 



A. metacarpea _ 

 volaris I 



- Ramus earpeus dorsalis 

 _ ^ Ramus earpeus volaris 



Rete carpi volare 



M. abductor digiti V 



Ramus volaris 

 profundus 



^ M. flexor digiti V 

 brevis 



Rami perforantes 



Aa. metacarpeae 

 volares II IV 



Aa. digitales 



volares 



communes 



Aa. digitales 



volares 



propriae 



460. Arteries of the right palm, deep layer. 



(All the structures have been removed with the exception of the mm. interossei, the muscles of the 

 baU of the little finger and the insertions of the mm. opponens poUicis and flexor pollicis brevis.) 



The aa. digitales volares propriae (see also Fig. 459) supply the volar surfaces and. 

 from the region of the first joint of the finger on, also the dorsal surfaces of the fingers. 



The arcus volaris profuiidus (0. T. deep palmar arch) lies directly upon the proximal 

 ends of the ossa metacarpalia and the mm. interossei, covered by the tendons of all the fiexors 

 of the fingers and by the ra. adductor pollicis. It forms a flatter curve than the superficial arch; 

 its convexity looks distalward. In its formation is chiefly concerned the termination of the 

 a. radialis, which anastomoses with the ramus volaris profundus of the a. idnaris. Proximalward 

 it gives olf branches to the rete carpi volare, distalward four aa. metacarpeae volares (0. T. 

 princeps pollicis, radialis indicis and palmar interosseous arteries) which run upon the mm. inter- 

 ossei. The first goes to the two margins of the thumb and to the radial margin of the index 

 finger. The 1^^, 3rd and 4th artery gives off, close to its origin, a ramus perforans, which 

 passes through the mm. interossei to the corresponding a. metacarpea dorsalis ; the arteries finally 

 anastomose, close to the heads of the ossa metacarpalia, with the aa. digitales volares communes. 



The rete carpi volare (0. T. anterior carpal rete) (see also Fig. 456) lies directly upon 

 the volar surface of the wrist and consists of several fine branches from the a. interossea volaris, 

 from the rami carpei volares of the aa. radialis and ulnaris and from the arcus volaris profundus. 



