ANATOMY OF THE BEND OF THE ELBOW 



645 



spiral nerve, to the space between the Brachialis anticus and Brachioradialis, 

 where it anastomoses with the recurrent branch of the radial artery ; while the 

 other, much the larger of the two, 

 descends along the back of the exter- 

 nal intermuscular septum to the back 

 of the elbow-joint, where it anasto- 

 moses with the posterior interosseous 

 recurrent, and across the back of the 

 humerus with the posterior ulnar re- 

 current, the anastomotica magna, and 

 inferior profunda (Fig. 465). The 

 superior profunda supplies the Tri- 

 ceps muscle and gives off a nutrient Sadial recurrmt . 

 artery which enters the bone at the 

 upper end of the musculospiral 

 groove. Near its commencement it 

 sends off a branch which passes up- 

 ward between the external and long 

 heads of the Triceps muscle to anas- 

 tomose with the posterior circumflex 

 artery, and, while in the groove, a 

 small branch which accompanies 

 a branch of the musculospiral nerve 

 through the substance of the Tri- 

 ceps muscle and ends in the Anco- 

 neus below the outer condyle of the 

 humerus. 



The nutrient artery (a. nutricia 

 humeri) of the shaft of the humerus 

 arises from the brachial, about the 

 middle of the arm. Passing down- 

 ward it enters the nutrient canal of 

 that bone near the insertion of the 

 Coracobrachialis mucle. 



The inferior profunda (a. collat- 

 eralis ulnaris superior], of small size, 

 arises from the brachial, a little below ****** 

 the middle of the arm; piercing 

 the internal intermuscular septum, it 

 descends on the surface of the inner 

 head of the Triceps muscle to the 

 space between the inner condyle and 

 olecranon, accompanied by the ulnar 

 nerve, and terminates by anastomos- 

 ing with the posterior ulnar recurrent 

 and anastomotica magna. It some- 

 times supplies a branch to the front 

 of the internal condyle, which anas- 

 tomoses with the anterior ulnar re- 

 current. 



The anastomotica magna (a. collat- FlG 462 _ The radial and ulnar arterieg 



eralis ulnaris inferior) arises from the 



brachial about two inches above the elbow-joint. . It passes transversely inward upon 

 the Brachialis anticus, and, piercing the internal intermuscular septum, winds 



Deep branch 

 of ulnar. 



