102 : ANATOMY OF THE DOMESTIC FOWL 



.-^- Narrow,, flat ribbon. 



Relations. Along the upper margin of the larger portion of the 

 deltoid. 



Action. Aids in extending the humerus. 



Supraspinatus (Fig. 19, No. 22). Location. Scapular region. 



Origin. From the superior surface and outer third of the scapula. 



Insertion. To the lower border of the pneumatic fossa of the 

 humerus. 



Shape. Thin, flat, triangular. 



Relations. Externally, with the trapezius and posteriorly, with 

 the teres et infraspinatus. 



Action. If the scapula is the fixed point it will pull the humerus 

 upward and backward. 



Subclavius. Location. Anterior sternal region. 



Origin. From the entire outer surface of the sternal process of 

 the sternum and the adjacent outer surfaces of three or four of 

 the hemapophyses. 



Insertion. To the inferior margin of the coracoid bone, the longer 

 fibers passing over to the fossa in the lower third of the posterior 

 part of the coracoid. 



Shape. Rather small, fleshy. 



Relations. Overlapped by the pectoralis tertius. 



Action. Pulls the coracoid outward. Also aids in keeping the 

 coracoid in place. 



Coraco-brachialis (Fig. 13, No. 15). Location. Along the cora- 

 coid shaft. 



Origin. By a delicate tendon from a small circular point on the 

 postero-mesial part of the shaft of the coracoid immediately above 

 the attachment of the subclavius and the fossa at that point. 



Insertion. To the top of the ulnar tuberosity of the humerus. 

 This subcircular space is common to the teres minor and to this 

 muscle. 



Shape. Long, fusiform. 



Relations. With the shaft of the coracoid between the teres 

 minor and subscapularis. 



Action. To depress the wing. 



Teres Minor (Fig. 13, No. 14). Location. The coraco-scapular 

 region. 



Origin. From under the side of the anterior tip of the scapula. 



Insertion. Passing outward behind the coracoid head and be- 



