^394 Harris Hawthorne Wilder, 



latter are somewhat confusedly blended. Indeed, it may be almost 

 better to ascribe to the latissiraus the tendon tliat iuserts into the 

 lip of the glenoid fossa, and consider tliat the fibers of the anconeus 

 scapularis take their origin from the distal edge of this tendon. 

 Yiewed from the inner aspect, however, the two mnscles appear to 

 hold the common tendon between them, the fibers on the one side 

 "being those of the insertion of the latissimus, the fibers upon the 

 other those of origin for the scapular anconeus. 



The point of attachment of this common tendon is a very defi- 

 uite one, namely, into the antero-dorsal lip of the glenoid fossa, 

 including both a projecting portion and a slight notch behind it, 

 where the lip of the fossa is almost deficient. 



anconeus humer alis lateralis (ahl). This portion, the 

 smallest of the four slips that make up the muscle, is a thin band 

 of parallel fibers lying obliquely across the lateral (outer) side of 

 the upper arm. It arises from the outer side of the shaft of the 

 humerus at its proximal edge, almost at the boundary between the 

 bone and cartilage. It is closely associated with the anconeus hume- 

 ralis medialis, from which it is separated by the large vessels which 

 pass between the two. 



anconeus humer alis medialis (ahm). This portion, which 

 may be distinguished as the profundus, is the deepest, and per- 

 haps the largest, of the four slips. It arises by fleshy fibers from 

 almost the entire dorsal face of the shaft of the humerus, covered 

 by the two preceding portions. 



anconeus coracoideus (ac). This is a medium sized band, 

 obliquely placed, and extended across the medial aspect of the 

 humerus, dorsal to M. coracobrachialis longus and nearly covering 

 M. scapulohumeralis. It arises from the posterior tuberosity of the 

 coracoid, just posterior to the glenoid fossa, runs as a distinct slip 

 as far as the distal third of the humerus, where it blends with the 

 inner edge of the anconeus scapularis. 



The four heads above decribed unite to form a very stout 

 tendon, which is of about the same caliber as the projecting ole- 

 cranon process of the ulna. to which it is attached, and thus may 

 almost be said to become continuous with it rather than to be in- 

 serted into it. 



M. coracobrachialis longus (cbl). This muscle and the 

 humeroantebrachialis inferior are the two long muscles of the flexor 

 surface of the upper arm, the former lying upon the medial (inner). 



