148 MUSCLE TISSUE 



spinatus fascia. These converge into the tendon of 

 insertion into the deltoid tubercle of the humerus. 



The Posterior Scapular Region. The muscles of this 

 region are as follows : 



Supraspinatus. Teres major. 



Infraspinatus. Teres minor. 



Supraspinatus. This arises from inner part of the 

 supraspinous fossa to region of the notch, from supra- 

 spinous fascia and transverse ligament; adherent to 

 capsule and infraspinatus tendon; inserted into the 

 upper of the three facets on the great tuberosity of 

 the humerus. 



Infraspinatus. It arises from the inner two-thirds 

 of the infraspinous fossa, and under surface of the 

 spine of the scapula, the fibers converge to a tendon 

 concealed within the muscle and inserted into the 

 middle facet of the great tuberosity. It may be 

 inseparably connected with the teres minor. 



Teres Minor. Origin, from narrow grooved surface 

 on the back of the scapula close to the axillary border, 

 from septa between it, the teres major, and infra- 

 spinatus; inserted into the lowest facet on the great 

 tuberosity and into the shaft for a short -distance 

 below. 



Teres Major. Is a thick somewhat flattened muscle. 

 Origin, from the oval surface on the back part of the 

 inferior angle of the scapula, and the fibrous septa 

 common to it, and the teres minor and infraspinatus; 

 inserted, by a flat tendon into the inner ridge of the 

 bicipital groove of the humerus. 



The Anterior Scapular Region. Subscapularis 

 Origin, by muscular and tendinous fibers from the 

 venter of the scapula and groove along the axillary 

 border, insertion, small tuberosity of the humerus 

 and into the shaft for a short distance. As in the 

 deltoid, this muscle contains two sets of septa one 



