THE POSTERIOR SCAPULAR REGION 



467 



The Teres minor (m. teres minor) is a narrow, elongated muscle, which arises 

 from the dorsal surface of the axillary border of the scapula for the upper two- 

 thirds of its extent, and from the two aponeurotic laminae, one of which separates 

 this muscle from the Infraspinatus, the other from the Teres major; its fibres 

 pass obliquely upward and outward, and terminate in a tendon which is inserted 

 into the jowest of the three facets on the greater tuberosity of the humerus. and 

 by fleshy fibres, into the humerus immediately below it. The tendon of this 

 muscle passes across the posterior part of the capsular ligament of the shoulder- 

 joint. 



Relations. By its superficial surface, with the Deltoid and the integument; by its deep 

 surface, with the scapula and dorsal branch of the subscapular artery, the long head of the 

 Triceps, and the shoulder-joint; by its upper border, with the Infraspinatus; by its lower border, 

 with the Teres inaior, from which it is separated anteriorly by the long head of the Triceps. 



FIG. 352. Muscles on the dorsum of the Scapula and the Triceps. 



The Teres major (m. teres major) is a thick but somewhat flattened muscle, 

 which arises from the oval surface on the dorsal aspect of the inferior angle of 

 the scapula, and from the fibrous septa interposed between it and the Teres 

 minor and Infraspinatus; the fibres are directed upward and outward, and termi- 

 nate in a flat tendon, about two inches in length, which is inserted into the inner 

 bicipital ridge of the humerus. The tendon of this muscle, at its insertion into 

 the humerus, lies behind that of the Latissimus dorsi, from which it is separated 

 by a synovial bursa, the two tendons being, however, united along their lower 

 borders for a short distance. A, bursa (bursa m. teretis majoris) is found between 

 the tendon of the Teres major and the bone. 



