

THE AKTEEIAL ARCHES OF THE WRIST AND HAND. 923 



Triceps 



(5) The dorsal carpal branch of the ulnar artery arises from the ulnar side of the ulnar 

 artery, immediately proximal to the pisiform bone. It passes dorsally, deep to the ulnar 

 flexor and the ulnar extensor of the carpus, to the dorsum of the carpus, where it unites 

 with the dorsal carpal branch 



of the radial to form the dorsal 

 carpal arch. 



(6) Prof unda. This branch 

 passes distally between the 

 abductor and flexor brevis 

 digiti quinti, and, turning to- 

 wards the radial side, deep to 

 the flexor brevis, the opponens 

 digiti quinti, and the long flexor 

 tendons and their sheaths, it 

 joins the termination of the 

 radial artery to complete the 

 deep volar (palmar) arch. 



Anconseus 



E ARTERIAL ARCHES OF 

 E WRIST AND HAND. 



Supinator - - 



Interosseous 

 recurrent" 

 artery 



Dorsal inter- 

 osseous artery 



Flexor carpi 

 ulnaris 



Extensor carpi 

 ulnaris 



Volar inter- 

 osseous artery 



Dorsal inter- 

 osseous artery 



Proximal per- 

 forating artery 



Dorsal nieta- 

 carpal arteries 



Pronator teres 



Abductor pollicis 

 longns (O.T. 

 Extensor ossis 

 raetacarpi pollicis) 



Extensor pollicis 

 longus 



Extensor pollicis 

 brevis 



Extensor indicis 

 proprius 



Radial artery 



Dorsales pollicis 

 arteries 



Arcus Carpeus Volaris 

 The Volar Carpal Arch (Figs. 

 768 and 769). The volar car- 

 pal arch lies on the volar aspect 

 of the volar carpal ligaments, 

 deep to the long flexor tendons 

 and their synovial sheaths. It 

 is formed by the union of the 



, volar carpal branches of the 



, radial and ulnar arteries, 

 and it receives the communi- 

 cating branch from the volar 

 interosseous artery and re- 

 current branches from the 



. deep volar arch. The branches 

 of distribution which pass 



_ from it supply the ligaments D r sai carpal arch 



; and synovial membrane of 

 the radio-carpal and inter- 

 carpal joints. 



Arcus Carpeus Dorsalis. 

 The Dorsal Carpal Arch. 



i (Fig. 770). This arch lies 

 on the dorsal carpal liga- 



: ments deep to the extensor 

 tendons and their sheaths. 

 It is formed by the union of 

 the dorsal carpal branches 

 of the radial and ulnar 

 arteries, and receives the ter- 

 minations of the volar and 

 dorsal interosseous arteries. 



FIG. 770. THE DORSAL INTEROSSEOUS ARTERY AND THE SECOND 



Branches. (a) Articular PART OF THE KADIAL ARTERY, WITH THEIR BRANCHES. 



the adjacent articulations. 



(b) Dorsal metacarpal, two slender branches which run distally, along the third and 

 fourth dorsal interosseous muscles, to the clefts of the fingers, where each divides into 

 dorsal digital branches. They communicate near their origins with the deep volar arch 

 by the proximal perforating arteries, and near their terminations with the volar digital 

 vessels through the distal perforating arteries. Their digital terminal branches run 



Brachio-radialis 



Extensor carpi 

 radialis longus 



Extensor carpi 

 ulnaris 



Extensor digitorum 

 communis 



Extensor carpi 

 radialis brevis 



Dorsal 

 interosseous nerve 



Dorsalis indicis 

 radialis 



