MYOLOGY 131 



To relax the inferior larynx: 



Sterno-trachealis. 

 To aid in respiration: 



When the first rib is fixed 



Intercostales. 

 When wing is fixed 

 Latissimus dorsi, 

 Dermo-cleido dorsalis. 

 When the scapula is fixed 

 Serratus magnus anticus, 

 Serratus parvus anticus, 

 Thoraco-scapularis, 

 Levatores costarum, 

 Appendico-costales, 

 Triangularis sterni. 

 To flex the shoulder-joint: 



Latissimus dorsi. 

 To elevate the humerus: 



Latissimus dorsi. 

 To draw the scapula forward: 

 Trapezius, 

 Rhomboideus. 

 To close the wing: 



Teres et infraspinatus. 

 To extend the humerus : 

 Coraco-humeralis, 

 Scapulo-humeralis. 



To pull the humerus upward and backward 

 When the scapula is fixed 



Supraspinatus. 

 To pull the coracoid outward :"! 



Subclavius. 

 To depress the wing: 



Coraco-brachialis. 

 To depress the scapula: 



When the ribs are fixed 



Thoraco-scapularis. 

 To rotate the humerus: 



Subscapularis. 

 To flex the forearm: 

 Pronator brevis, 

 Biceps, 



Brachialis anticus, * 

 Anconeus, 



Tensor patagii longus, 

 Tensor patagii brevis. 

 To extend the arm: 

 Deltoid. 



