294 A MANUAL OF ANATOMY. 



brevis, pronator radii teres, flexor sublimis digitorum, flexor 

 longus pollicis, and pronator quadratus muscles, and the 

 lower end of the radius. 



The accompanying veins are on the outer and inner sides 

 of the artery. While the artery is overlapped by muscles 

 in the upper part of its course, it is only covered by the 

 fascia and skin in the lower two-thirds. 



Branches of the Radial Artery. 



(i) Radial recurrent. This is a large branch from the 

 outer side of the artery below its origin. It passes out- 

 ward, supplying branches to the supinator longus, extensor 

 carpi radialis longior and brevior, and supinator brevis, 

 then turns upward between the supinator longus (brachio- 

 radialis) and brachialis anticus to terminate in branches to 

 these muscles and by anastomizing with branches from the 

 superior profunda artery. (2) Muscular. To the sur- 

 rounding muscles. (3) Anterior carpal. A very small 

 branch to the front of the carpus. (4) Superficial volar. 

 Variable in size and occurrence. Usually a small branch 

 to the base of the thumb muscles, and terminating in them ; 

 at other times a larger branch that crosses beyond the 

 thumb to anastomose with the ulnar to form the superficial 

 palmar arch. For the remaining branches see back of 

 hand. 



DISSECTION. 



Divide the flexor carpi radialis, palmaris longus, and flexor carpi ulnaris 

 where they become tendinous, and the pronator radii teres at its outer and 

 middle thirds. 



Clean the flexor sublimis digitorum, the anterior surface of the supinator 

 brevis, the upper and lower thirds of the ulnar artery, and the ulnar nerve 

 from the internal condyle to the wrist. 



Flexor Sublimis Digitorum. Fig. 66. 



Origin. (i) From the internal condyle of the humerus 

 and internal lateral ligament of the elbow-joint. (2) From 



