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THE VASCULAR SYSTEMS 



Anastomotica 

 magna. 



The perforating arteries (rami perforantes) (Fig. 464), three in number, pass 

 backward from the deep palmar arch through the second, third, and fourth inter- 

 osseous spaces and between the 

 heads of the corresponding Inter- 

 ossei, to anastomose with the 

 dorsal interosseous arteries. 



The palmar interosseous (aa. 

 metacarpeae volares) (Fig. 464), 

 three or four in number, arise 

 from the convexity of the deep 

 palmar arch ; they run downward 

 upon the Interossei muscles, and 

 anastomose at the clefts of the 

 fingers with the digital branches 

 of the superficial arch. 



The palmar recurrent branches 

 arise from the concavity of the 

 deep palmar arch. They ascend 

 in front of the wrist, supplying 

 the carpal articulations and anas- 

 tomosing with the anterior carpal 

 arch. 



Posterior 

 interosseous. 



Anterior ulnar 

 recurrent. 



Posterior ulnar 

 recurrent. 



Muscular. 



Anterior carpal 

 Superficialis volse 



Anterior carpal. 



Deep branch of 

 ulnar. 



The Ulnar Artery (A. Ulnaris) 

 (Figs. 462, 464). 



The ulnar artery, the larger of 

 the two terminal branches of the 

 brachial, commences a little below 

 the bend of the elbow, and passes 

 obliquely across the inner side of 

 the forearm to a point about mid- 

 way between the elbow and the 

 wrist. It then runs along the 

 ulnar border to the wrist, crosses 

 the annular ligament on the radial 

 side of the pisiform bone, and 

 immediately beyond this bone 

 divides into two branches which 

 enter into the formation of the 

 superficial and deep palmar 

 arches. 



FIG. 464. Ulnar and radial arteries. Deep view. Relations. In the Forearm. In 



its upper half it is deeply seated, being 



covered by all the superficial Flexor muscles, excepting the Flexor carpi ulnaris; the median 

 nerve is in relation with the inner side of the artery for about an inch and then crosses the vessel, 

 being separated from it by the deep head of the Pronator teres; it lies upon the Brachialis 

 anticus and Flexor profundus digitorum muscles. In the lower half of the forearm it lies upon 

 the Flexor profundus, being covered by the integument, the superficial and deep fasciae, and is 

 placed between the Flexor carpi ulnaris and Flexor sublimis digitorum muscles. It is accom- 

 panied by two venae comites; the ulnar nerve lies on its inner side for the lower two-thirds of 

 its extent, and a small branch from the nerve descends on the lower part of the vessel to the 

 palm of the hand. 



