SUPERFICIAL PALMAR ARCH. 



493 



runs down the back part of the forearm between the superficial and deep layer 

 of muscles, to both of which it distributes branches. Descending to the back 

 of the wrist, it anastomoses 



288. Arteries of the Buck of the Forearm and Hand. 



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with the termination of the 

 anterior interosseous, and with 

 the posterior carpal branches 

 of the radial and ulnar arteries. 

 This artery gives off, near its 

 origin, the interosseous recurrent 

 branch, a large vessel, which 

 ascends to the interval between 

 the external condyle and ole- 

 cranon, beneath the Anconeus 

 and Supinator Brevis, anasto- 

 mosing with a branch from the 

 superior profunda, and with the 

 posterior ulnar recurrent, and 

 anastomotica magna. 



The muscular branches are 

 distributed to the muscles along 

 the ulnar side of the forearm. 



The carpal brandies are in- 

 tended for the supply of the 

 wrist-joint. 



The anterior carpal is a small 

 vessel which crosses the front 

 of the carpus beneath the ten- 

 dons of the Flexor Profundus, 

 and inosculates with a corres- 

 ponding branch of the radial 

 artery. 



The posterior carpal arises 

 immediately above the pisiform 

 bone, winding backwards be- 

 neath the tendon of the Flexor 

 Carpi Ulnaris ; it gives off a 

 branch which passes across the 

 dorsal surface of the carpus be- 

 neath the extensor tendons, an- 

 astomosing with a correspond- 

 ing branch of the radial artery, 

 and forming the posterior car- 

 pal arch ; it is then continued 

 along the metacarpal bone of 

 the little finger, forming its 

 dorsal branch. 



The deep or communicating 

 branch (Fig. 287), arises at the 

 commencement of the palmar 

 arch, and passes deeply inwards 

 between the Abductor Minimi 

 Digit! and Flexor Brevis Minimi Digiti, near their origins; it anastomoses with 

 the termination of the radial artery, completing the deep palmar arch. 



The digital branches (Fig. 286), four in number, are given off from the con- 

 vexity of the superficial palmar arch. They supply the ulnar side of the little 

 finger, and the adjoining sides of the little, ring, middle, and index-fingers ; the 

 radial side of the index-finger and thumb being supplied from the radial artery. 



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