SHOULDER AND ARM. 



ones are multipennate and attached above and below to three 

 or four septal tendons. Insertion; outer side of shaft of hu- 

 merus at the V-shaped impression lying above the spiral 

 groove. A bursa separates the muscle from the shoulder- joint 

 capsule. [327] 



Supraspinatus. Origin ; supraspinous fossa and fascia cov- 

 ering it. Course; under the acromion process and coraco- 

 acromial ligament. Insertion; (by a broad, thick tendon) 

 uppermost facet on great tuberosity of humerus; capsule of 

 shoulder joint. [329] 



Infraspinatus. Origin; infraspinous fossa (except a flat 

 surface along the axillary border) and fascia covering it. 

 Course; a bursa separates it from the neck of the humerus. 

 Insertion ; middle facet of great tuberosity of humerus ; capsule 

 of shoulder joint. [329] 



Teres Minor. Origin; upper two-thirds of flat surface on 

 back of axillary border of scapula. Insertion ; lowest facet on 

 great tuberosity of humerus ; shoulder- joint capsule. [329] 



Teres Major. Origin; lower third of flat surface on back 

 of axillary border of scapula, except a small area at lower 

 angle. Course ; the upper border is separated from the Sub- 

 scapularis and Teres minor by a triangular interval which the 

 long head of the Triceps divides into two openings, one quadri- 

 lateral and the other triangular. Insertion; inner border of 

 bicipital groove of humerus. [330] 



Subscapularis. Origin; whole subscapular fossa, except at 

 the angles; septa attached to the ridges in the fossa. Inser- 

 tion; lesser tuberosity of humerus; capsule of shoulder joint. 

 A bursa separates it from the neck of the scapula. [330] 



Dorsal Group. 



Latissimus Dorsi. Origin; vertebral aponeurosis (connect- 

 ing it with the spine) ; posterior part of iliac crest; lower three 

 or four ribs, by fleshy interdigitations with External oblique; 

 (usually) lower angle of scapula. Insertion ; floor of bicipital 



[159] 



