116 THE MYOLOGY OF THE RAVEN. 



forearm ; while its longer and more tendon-like fork 



O 



runs back with the tendon of the extensor metacarpi 

 radialis longus, to become inserted just below the 

 tubercle of the external condyle of the humerus, the 

 insertion of the extensor itself monopolizing the outer 

 aspect of the tubercle in question (Fig. 33). 



The action of these muscles is well described in the 

 quotations of the several eminent authorities I have 

 incorporated with my own descriptions above. 



MUSCLES OF THE BRACHIUM. 



We come now to take up those muscles of the 

 upper extremity which more properly belong to the 

 humeral region, and are in most instances inserted 



o 



into the bones of the forearm. Under this division of 

 the muscles of the upper extremity, I will notice the 

 following : - 



O 



69. The biceps, 71. The triceps. 



70. The deltoid. 72. The brachiiilis anticus. 



69. The biceps l is a large and powerfully developed 

 muscle in the Raven. To study it satisfactorily we 



1 For further and important studies of the biceps muscle in birds, 

 see Gadow (loc. cit., p. 261), who records the subjoined synonymy : 



"79. M. BICEPS BRACK 1 1. 



Le biceps. Vicq d'Azyr, 1773, p. 570; Cuvier. 

 Zusammenleger des Fliigels. Merrem, p. 155, No. 3. 

 Zweikopfiger Armmuskel. Wiedernann ; Prechtl, 46. 

 Biceps. Tiedemann, 258; Heusinger, p. 184. 



Meckel, System, p. 322 ; d' Alton, p. 22. 



RUdinger, p. 99 ; Selenka, p. 124, No. 51 ; De Man, p. 111. 



,, Fiirbringer ; Carlsson, p. 26. 



Biceps brachial. Gervais et Alix ; Watson, p. 102 ; Alix, p. 405. 

 Flexor antibrachii longus s. biceps brackii. Schopss, p. 135, No. 24." 



Gadow divides the muscle into two parts I. m. biceps brachii, 

 and II. pars propatayialis (compare footnotes under the account of 

 the tensor patagial muscles of the present work). 



