SHOULDER, ARM, FOREARM, AND HAND. 



179 



the flexor carpi radialis, the palmaris longus, flexor sublimis digitorum, and turn 

 them aside, but do not injure the nerves and vessels to the same. Find the 

 ulnar artery, and you will see it passes behind all these three muscles. Now 

 trace it a little further, and see it pass behind the flexor sublimis digitorum and 

 median nerve. Here you will find it has reached the ulnar groove. Remem- 



Capsular ligament 

 Internal lateral ligament 



Tubercle for the flexor sublimis 



digitorum 

 Internal lateral ligament 



Brachialis auticus 

 Pronator radii teres (lesser head) 



Flexor longus pollicis (accessory head) 



ULNA 



Interosseous membrane 



Flexor profundus digitorum 



Pronator quadratus 



Anterior radio-ulnar ligament 

 Internal lateral ligament 



GREATER SIGMOIO FOSSA 



HEAD OF RADIUS 

 NECK OF RADIUS 

 Lower limit of orbicular ligament 



Oblique ligament 



BICIPITAL TUBERCLE 



Oblique ligament 

 Supinator brevia 



Flexor sublimis digitorum 



OBLIQUE LINE 



RADIUS 



Prouator radii teres 



flexor longus pollicis 



Pronator quadratus 



Supinator longus 

 External lateral ligament 



Interarticular flbro-cartilage Anterior radio-carpal ligament 



FIG. 124. THE LEFT ULNA AND RADIUS. (Antero-internal view.) 



ber the course : behind the median nerve and all the muscles originating from 

 the inner condyle, except the flexor carpi ulnaris. 



The radial' s course (Fig. 117): You will find it very superficial. It begins 

 at the bifurcation of the brachial artery in the cubital fossa. Now demonstrate 

 the fact that this artery lies on : (i) Biceps tendon ; (2) supinator brevis ; (3) 

 flexor sublimis digitorum ; (4) pronator radii teres ; (5) flexor longus hallucis ; (6) 

 pronator quadratus. These structures form the floor of the radial groove. 



The flexor sublimis digitorum (Fig. 122) is brought into view by turning 



