62 



ANATOMY OF THE DOMESTIC FOWL 



distal extremity of the humerus and the tuberculum internum of 

 the ulna (Fig. 14, No. 9). 



The ligamentum annulare radii originates on the olecranon, sur- 

 rounds the head of the radius, and is attached to the tuberculum 

 internum of the ulna (Fig. 15, No. 3). 



The ligamentum cubiti teres extends from the head of the radius 

 to the upper end of the ulna (Fig. 15, No. 4). 



FIG. 14. Muscles and ligaments of the arm and forearm of a hen. 



A. External view, i, Expansor secundarium. 2, Tensor patagii longus. 3, 

 Tensor patagii brevis. 5, Brachialis anticus. 6, Pronator longus. 7, Supinator 

 brevis. 8, Extensor indicis brevis. 10, Scapulo-humeralis. 



B. Internal view. 9, Ligamentum laterale cubiti internum. 



The ligamentum transversum spreads out between the head of the 

 ulna and the radius, thus uniting the two bones, and limiting supina- 

 tion (Fig. 15, No. i). 



Ligaments of the Carpal Joint. The carpal joint is made up of 

 the ulna, radius, the two carpal bones and the metacarpus. . 



There are two strong ligamenta obliqua carpi ulnaris which ex- 



