142 ANATOMY OF UPPER EXTREMITY, ETC. 



ulnar artery; its tendon receives short muscular fibre 

 nearly down to the point of its insertion, which is into th( 

 pisiform bone and base of the metacarpal bone of the littlt 

 linger. At its upper part this muscle overlaps the ulnai 

 artery and nerve; below the middle they are upon 

 inner side of its tendon. 



The flexor carpi radialis and palmaris longus muscles must be 

 divided in their middle and the two ends reflected, as, at their upper 

 part, they cover up the muscle next to be dissected. The numerous 

 branches of the ulnar artery at the elbow should be carefully preserved. 



The FLEXOR SUBLIMIS DIGITORUM forms a large part of 

 the muscular mass arising from the inner condyle; it also 

 arises from the coronoid process of the ulna and the oblique 

 line of the radius ; inferiority it divides into four tendons 

 which pass beneath the annular ligament to be inserted into 

 the bases of the second phalanges of the fingers, as will be 

 seen in the dissection of the hand. Beneath the annular 

 ligament the tendons are provided with a synovial mem- 

 brane. A muscular slip often connects this muscle with 

 the flexor profundus, or the flexor longus pollicis. 



The upper part of the flexor sublimis, where it arises 

 from the radius, is covered by the pronator radii teres, the 

 tendinous insertion of which, winding round the radius, as 

 well as its coronoid head, can now be seen. The tendon of 

 the biceps may also be followed between the muscles to its 

 insertion into the tubercle of the radius. The brachialis 

 anticus will likewise be exposed so that its insertion into 

 the coronoid process of the ulna can be examined. None 

 of these insertions could be seen when the bellies of these 

 muscles were dissected. 



The SUPINATOR LONGUS MUSCLE gives the rounded out- 

 line characteristic of the outer side of the forearm ; it 

 arises from the humerus on its outer side, nearly as high 

 as the insertion of the deltoid muscle, and from the external 

 condyloid ridge ; it passes down the radial side of the fore- 

 arm and is inserted by a flattened tendon into the external 

 border of the radius, just above the base of its styloid 

 process. 



The RADIAL ARTERY, with its venae comites, lies upon 

 the inner side of the last-named muscle at its upper part, 

 and between it and the pronator radii teres; lower down 

 it lies between the supinator longus and flexor carpi radi- 

 alis ; at its upper part it gives off the radial recurrent 



