672 T)r. HARRIS H WII.DER, 



The existence of this twig proves the source of its nerve supply 

 and I am quite confident that later dissections will be able to de- 

 monstrate the existence of some large branch from the Ramus maxillae 

 iuferioris, which must reach the muscle from above. 



17. Muscles of the shoulder-girdle. 



Inasmuch as the shoulder - girdle lies so near to the visceral 

 skeleton, many of the muscles of the upper extremity are intimately 

 connected with some of those above described. 



In order to assist in the interpretation of this difficult region, 

 I subjoin a list of such shoulder muscles as fall under the province 

 of this thesis. 



1) C u c u 1 1 a r i s (fig. 2 cu). 



A thin, fan-shaped muscle, lying immediately beneath the dorso- 

 trachealis, and completely covered by it. It arises from the dorsal 

 fascia beneath the origin of the dorso-trachealis and is inserted into 

 the external surface of the scapula near the middle. 



2) Dorsalis scapulae (fig. 2 d.s.). 



This muscle lies entirely upon the surface of the scapula and 

 forms a conspicuous object in a dissection of this region. 



3) Dorso- humeralis (latissimus dor si) (fig. 2 d.h.). 

 From the Fascia dorsalis to the humerus ; it lies behind the scapula 



and is in Siren very poorly developed. 



4) Basi-scapularis (levator scapulae). 



From the Os basilaris to the anterior margin and anterior superior 

 angle of the scapula. 



5) T h r a c o - s c a p u 1 a r i s (s e r r a t u s m a g n u s). 



From the ribs and musculature of the trunk, anteriorly to the 

 under, inner side of the scapula. 



IV. Glandula thyroidea. 



This enormous gland is exposed during the dissection of the 

 muscles of the throat and can be best studied immediately after the 

 removal of the genio - hyoideus (fig. 4 Gl. Th.). The gland is extra- 

 ordinarily large and, although it is somewhat variable in difierent in- 

 dividuals, the following description gives, perhaps, the most usual 

 relations. 



It consists of five lobes, the most anterior one being medial, 

 posteriorly from which extend diagonally two long lateral lobes. 



