82 THE MYOLOGY OF THE RAVEN. 



It is well developed in a Eaven, and as in the majority 

 of birds, divided into two distinct slips. As a whole, 

 however, it is a thin, fan-shaped muscle, or more 

 properly speaking, a triangular one, with its apex at 

 its insertion upon the humerus, and its hase at its 

 origin, attached to the vertelu'al spines. 



The anterior slip arises from the outer edges of the 

 superior margins of the neural spines of that vertebra 

 that bears the last pair of free rd^s, and the one next 

 succeeding it, whose ril)s articulate with costal ribs ; 

 the posterior slip arises from the similar margins of 

 all the following neural spines of the verte1)r8e of the 

 dorsum, which are four in number. This latter origin 

 partakes very largely of a thin fascia-like character. 

 From this combined origin, the fibres of the intimately 

 connected slips rapidly converge as they pass directly 

 to the humerus; they enter between the deltoid, the 

 scapular head of the triceps, and the remaining heads 

 of the latter muscle, to be inserted upon the shaft of 

 tliat Itone, on its anconal aspect, just within the 

 maro-iu of the radial crest, as a flat, ril)bon-like 

 muscle in this division of its course (Fig. 27). 



53. The traj^ezius ^ lies immediately beneath the 



^ Attention is invited in this connection to Gegenbaur's Anat. des 

 Mensehen, 1883, p. 311. The following synonymy I take from 

 Gadow (Bronn's Klassen, vi. Band, p. 217), who describes the 

 trapezius under the name of the m. rhomboideus superjickdis : — 



" 65a. M. KIIOMBOIDEUS SUPERFICIALIS. 



Trajyezoide. Vicq d'Azyr, 1772, p. 630, No. 1. 

 Trapeze. Cuvier ; Gervais et Alix, p. 21. 

 Aufzieher des Schulterblatts. Merrem, p. 154, No. 9. 

 Kappenmuskel s. Cucidlaris. Wiedemann, p. 84. 



„ ., ,, Tiedemann, § 242. 



„ ,, „ Schopss, p. 90. 



Selenka, p. 107, No. 32. 



