RADIAL ARTERY. 



Fig, 278. the middle of the bend of the elbow to the 



narrow interval between the trapezium bone 

 and the tendons of the extensors of the 

 thumb, which can be readily felt on the 

 outer border of the wrist. 



-TV 



Fig. 278. ARTERIES OF THE OUTER AND BACK 

 PART OF IHE ARM AND HAND, SUPERFICIAL 

 VIEW (from Tiedemann). 



a, deltoid muscle ; &, external humeral head of 

 triceps ; c, biceps brachii ; d, brachialis anticus ; 

 e, supinator longus ; /, extensor carpi radialis 

 longior ; g, brevior ; A, extensor communis digi- 

 torum and extensor minimi digiti ; i, extensor 

 carpi ulnaris ; Jc, anconeus ; Z, flexor carpi ulnaris ; 

 m, extensor ossis metacarpi pollicis ; , extensor 

 primi iuternodii pollicis ; 0, tendon of the extensor 

 secundi internodii pollicis ; 1,1, branches of 

 superior profunda artery appearing between the 

 triceps and brachialis anticus, and descending 011 

 the outer supracondyloid eminence to anastomose 

 with the branches of the recurrent radial artery ; 

 2, above the posterior annular ligament points to 

 the posterior carpal branch of the interosseous 

 artery ; 3, posterior carpal branch of the ulnar 

 artery ; 4, radial artery taking its course between 

 the outer lateral ligament of the wrist-joint and 

 the tendons of the extensor muscles before passing 

 near 5, between the two heads of the abductor 

 indicia : beneath the extensor tendons is seen the 

 posterior carpal arch, giving the third and fourth 

 dorsal interosseous arteries ; 6, the inner dorsal 

 artery of the thumb ; 7, the outer dorsal artery 

 of the index finger, and between 7, and 7', the 

 remaining dorsal digital vessels in the spaces 

 between the heads of the metacarpal bones, near 

 their communications with the palmar digital 

 vessels. 



The radial artery is nearer to the surface 

 than the ulnar, and is covered only by 

 the common integument and fascia, except 

 where it is overlapped by the fleshy part of 

 the supinator lougus, which must be drawn 

 aside in order to bring the vessel into view. 

 At first it is in contact with the tendon of 

 the biceps, and is supported by the fatty 

 tissue contained in the hollow in the front 

 of the elbow, which separates it from the 

 short supinator muscle. It then rests in 

 succession on the insertion of the pronator 

 teres, the thin radial origin of the flexor 

 sublimis, the flexor pollicis longus, the 

 pronator quadratus, and the lower end of 

 the radius. It is at this last point that 

 the pulse is usually felt during life. To 

 the inner side of this vessel lie the pronator 

 teres in the upper part of its course, and 



