116 THE MYOLOGY" OF THE RAVEN". 



forearm ; while its loiio;er and more tendoii-like fork 

 runs back with the tendon of the extensor metacarpi 

 radialis longus, to Ijecome inserted just heloiv 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 

 ujDper extremity which more properly belong to the 

 humeral reoion, and are in most instances inserted 

 into the bones of the forearm. Under this division of 

 the muscles of the upper extremity, I will notice the 

 following : — ■ 



69. The biceps, 7L The triceps. 



70. The deltoid. 72. The brachialis anticus. 



G9. The biceps ^ is a large and powerfully developed 

 muscle in the Raven. To study it satisfactorily we 



^ For fur-ther and important studies of the biceps muscle in birds, 

 see Gadow [loc. cit., p. 261), who records the subjoined synonymy : — - 



"79. M. BICEPS BRACHri. 



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

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

 Zweikopfiger Armmuskel. Wiedemann ; Prechtl, § 46. 

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



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



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



,, FUrbringer ; Carlsson, p. 26. 



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

 Flexor avtibracliii longus s. biceps brachii. Schopss, p. 135, No. 24." 



Gadow divides the muscle into two parts — I. m. bice2)s brachii, 

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

 the tensor patagial muscles of the present work). 



