52 



TOPOGEAPHICAL ANATOMY OF 



humeral and radial heads of the deep flexor. A very minute inter- 

 osseous nerve (n. interosseous) passes through the gap between the 

 radius and the ulna and ends in the periosteum. 



A. mediana. — The median artery, the direct continuation of the 

 brachial, follows the median nerve very closely. As the two structures 

 cross the line of the elbow joint, it is customary for the nerve to 

 traverse the medial face of the artery obliquely and thereafter follow its 



M. extensor carpi radialis. 



N. cutaneus antibrachii 

 lateralis 



V. cephalica accessoria. 

 Radius. 



N. cutaneus antibrachii 

 lateralis. 



V. cephalica antibrachii. 



M. flexor digitorum pro- 

 fundus (caput radiale). 

 A. mediana. 



V. mediana. 



N. medianus 



M. flexor carpi radialis. 



M. flexor carpi Julnaris. 



A. collateralis radialis. 



_5I. extensor digitorum 

 communis. 



H. abductor pollicis. 



JLDorsal interosseous 

 vessels. 



__M. extensor digiti 

 quinti. 



M. flexor digitorum 

 profundus (caput 

 humerale). 



M.. extensor carpi 

 ulnaris. 



M. flexor digitorum profundus 

 (caput ulnare). 

 "■*■ N. ulnaris. 



\ x - N. collateralis ulnaris. 

 \ 

 V. collateralis ulnaris. 



M. flexor digitorum sublimis. 



Fig. 34. — Section across the Forearm at the Level indicated by D in Fig. 30. 



posterior border for a variable distance, but other relations are possible, 

 as mentioned above. 



In the space between the radial and ulnar flexors the artery ter- 

 minates, after giving off the medial and lateral volar metacarpal 

 arteries, by becoming the common digital artery. 



In addition to articular, muscular, and cutaneous branches, the 

 median furnishes the common interosseous artery and the artery of the 

 volar rete of the carpus. 



A. interossea communis.' — The common interosseous artery arises 

 opposite the space between the radius and the ulna. In the dog and 

 pig it divides into volar and dorsal interosseous branches, but in the 

 horse the volar is very small or absent. In this animal, therefore, the 



