MUSCLES OF THE ARM. 261 



aspect of the brachium and antebrachium, and the ental aspect of 

 the scapula. 



Preparation. The cephalic (outer) aspect of the same arm is 

 shown in Fig. 75. The caudal aspect of the scapular region is also 

 represented in Fig. 73, but the position of the whole limb is there 

 reversed. The serratus magnus and levator anguli scapulce have 

 been transected a little nearer the scapula than the rhomboideus, 

 which appears ectad of them. The bicipital arch has been divided, 

 and the biceps and epitrochlearis transected and reflected so as to 

 expose the coracoideus and entotriceps. The muscles on the caudal 

 and ventral aspect of the antebrachium have been merely freed 

 from fat and fascia. 



Bones, etc. Antebrachium the forearm; brachium the upper arm or proximal 

 segment of the arm. 



Fm, (Foramen) epitrochleare (Fig. 46, 417). A part of its ventral orifice is covered by 

 the humeral end of the M. entotriceps, dv. brecis. 



Humerus (Fig. 45, 46, 68-71, 407). Most of the caudal aspect of this bone is exposed ; 

 the trochin appears at the proximal end. 



Olecranon (Fig. 30, 220). The prominence of the elbow, 



Prc. (Processus) coracoideus The coracoid process of the scapula (Fig. 43, 44, 45, A, 

 400). In the shaded space between the supraspinatus and subscapularis projects the tip 

 of this process. Connected therewith are the origin tendon of the coracoideus and the 

 tendinous slip from the insertion tendon of the entopectoralis, dv. cephalica. 



Muscles. The following have been sufficiently described elsewhere, and in the expla- 

 nations of the figures whose numbers are placed in parentheses: 



Latissimus (67), 635 ; subscapularis (73), 670 ; supraspinatus (67, 73), 675 ; supina- 

 tor longus (74), 690. 



Biceps ( 694). The distal end is seen to pass to the ulna between the proximal ends 

 of the two groups of muscles lying on the ventral aspect of the antebrachi am : iheflexores, 

 including the pronator teres, and the extensores, including the supinator longus (see 695). 

 The tendon of origin passes entad of and through the Canalis bicipitalis to the TbcL bicipi- 

 tale (Fig. 45, A) of the scapula, but in this figure it has the appearance of continuity with 

 the slip from the entopectoralis to the Prc. coracoideus. 



Brachialis ( 692). Only a portion is seen between the MM. pronator and ectopectoralis. 



Coracoideus ( 668). The caput breve has been shown in Fig. 73, and appears here 

 passing cephalad of (behind) the insertion tendon of the MM. teres and latissimus. The 

 caput longum is seen to pass caudad of the same tendon, to become a very slender, thread- 

 like tendon, and to become attached to the ventral margin of the Fm. epitrochleare. 



Ectopectoralis, Im. entalis, do. caudalis ( 653). The remnant of muscle so named evi- 

 dently includes also part of the caudal division of the entopectoralis. 



Entopectoralis ( 658). The name begins near the insertion tendon of the cephalic 

 division. 



Entotriceps, dv. brecis ( 638). This is not only the shortest division of the entotriceps, 

 but forms a very different angle with both the humerus and the olecranon. 



Entotriceps, dv. caudalis ( 687) ; dv. cephalica ( 689) ; dv. intermedia ( 686). -The 

 relative positions of these three divisions of ths entotriceps are more clearly shown upon 



