_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 coracoid 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 beneath the neck of the scapula, it is attached by a small tendon to the top of the ulnar tuberosity of the humerus in common with the coraco-brachialis, with which tendon it fuses. _Shape._—Small, chunky. _Relations._—Anteriorly, with the tip of the scapula and behind the coracoid head. Posteriorly, with the coraco-brachialis. _Action._—Aids in the downward stroke of the wing. =Levator Scapulæ.= _Location._—Scapular region. _Origin._—By two strong digitations, one from each of the lateral processes of the first cervical vertebra. _Insertion._—To the middle third of the inferior part of the blade of the scapula. _Shape._—Small and flat. _Relations._—Inferior to the scapula. _Action._—Pulls the scapula forward, and with it the entire shoulder girdle, which articulates like a hinge-joint at the costo-sternal juncture. =Thoraco-scapularis.= _Location._—Lateral side of the chest. _Origin._—From the outer part of the lower half of the first free rib, the outer side of the next succeeding rib and its epineural appendage, and from a similar surface on the next rib. _Insertion._—By a broad, flat tendon which passes between the two divisions of the subscapularis and inserts at a point at the juncture of the anterior and middle third of the outer margin of the scapula. _Shape._—Broad, flat. _Relations._—Internally, with the ribs and the scapula.