I02 ANATOMY OF THE DOMESTIC FOWL 



Shape. — 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 wiU puU 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 pectoraUs tertius. 



Action. — PuUs 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.^— Yrova under the side of the anterior tip of the scapula. 



Insertion. — Passing outward behind the poracoid head and be- 



