388 Hareis Hawthorne Wildee, 



and suggests some of the conveniences which would result from 

 a more complete correspondence in tlie nomenclatnre of the 

 two limbs. 



The description of the separate mnscles follows: 



A. Muscles between the trunk (or head) and the shoulder-girdle. 



1. Dorso-lateral aspect. 



M. latissimns dorsi (Jd). This muscle, the most posterior 

 of the group, is in the form of a broad fan-shaped sheet, covering 

 the sides of the body between the fifth and the eighth myocommata, 

 and completely concealing M. serratus anterior, which lies beneath 

 it. The more anterior fibers, about one half of the muscle, take 

 their origin in a very thin, perfectly transparent aponeurosis, which 

 lines the under side of the skin in that region, so that the fibers 

 seem to be attached to the skin directly. The remaining half is in 

 its origin divisible into two slips, which arise from myocommata 7 

 and 8 respectively. The slip from rnyocomma 8 runs almost hori- 

 zontally forward and its fibers are the most posterior of the sheet; 

 those of the slip from rnyocomma 7 run more obliquely and the most 

 anterior of these are directly continuous with the most posterior 

 fibers of the anterior half. 



From this extensive origin the fibers converge to the glenoid 

 fossa, where they become inserted along the proximal side of a stout 

 tendon common to it and to M. anconeus scapularis. This tendon, 

 which furnishes insertion for the latissimus but origin for the an- 

 coneus, is attached to the antero-lateral lip of the glenoid fossa, and 

 serves to reinforce the capsular ligament of the Shoulder Joint. 



M. dorsalis scapulae (ds). This is a narrow, fan-shaped 

 muscle, which covers the lateral (outer) surface of the scapula and 

 suprascapula. It thus belongs in the same series with the procoraco- 

 humeralis and supracoracoideus, which together cover the three 

 divisions of the shoulder-girdle. However, instead of arising from 

 a large part of the area which it covers, as is the case with the 

 two just named, the dorsalis scapulae arises from a narrow, curved 

 line upon the suprascapula, parallel with the free margin and quite 

 near to it; throughout the remainder of its course it is free from 

 the skeletal part which it covers. It converges to its insertion into 





