MYOLOGY. 67 



(B) Sterno-prescapularis. 



Origin. Sides of inferior border of sternum, and cartilages of 

 first three or four ribs. 



Insertion. Supra-spinatus fascia. 



Action. Pulls scapula backward and downward. 



Nerve. Sixth and seventh cervical. 



ANTEA SPINATUS. 



Origin. Antea-spinous fossa. 



Insertion. By two tendons into external and internal humeral 

 tubercles. 



Action. Extensor of humerus. 

 Nerve. Sixth and seventh cervical. 



POSTEA SPINATUS. 



Origin. Postea-spinous fossa, acromion spine and tuberosity. 

 Insertion. External humeral tuberosity. 

 Action. Abductor and external rotator. 

 Nerve. Sixth and seventh cervical. 



TERES MAJOR. 



Origin. One head from dorsal angle and the other from 

 aponeurosis and tuberosity of spine of scapula. 

 Insertion. Deltoid imprint of humerus. 

 Action. Abductor and external rotator. 

 Nerve. Eighth cervical. 



TERES MINOR. 



Origin. Posterior border and postea-spinous fossa of scapula 

 and margin of glenoid cavity. 



Insertion. Humerus between external and deltoid tuberosities. 

 Action. Like preceding. 

 Nerve. Circumflex. 



SUBSCAPULARIS. 



Origin. Subscapular fossa. 

 Insertion. Internal tubercle of humerus. 

 Action. Adductor and internal rotator. 

 Nerve. Seventh cervical. 



