74 ANATOMY AND PHYSIOLOGY. 



neck. Inserted into the os occipitis at its tubercle. Use To 

 assist the rectus major. 



Obliquus capitis superior arises from the transverse process of the 

 atlas. Inserted into the end of the lower occipital ridge. Use 

 To draw the head backwards. 



Obliquus capitis inferior arises from the spinous process of the 

 dentatus. Inserted into the transverse process of the atlas. Use 

 To draw the face to one side. 



Scalenus arises from the upper surface of the first and second ribs. 

 Inserted into the transverse processes of the cervical vertebrae. 

 Use To move the neck forward or to one side. 



Interspinales arises between the spinous processes of the six in- 

 ferior cervical vertebrae. Inserted into the spinous processes of the 

 vertebrae above. Use To draw the spinous processes towards 

 each other. 



Inter-transversales arises between the transverse processes of the 

 vertebrae. Inserted into the transverse processes of the vertebrae 

 above. Use To draw the transverse processes towards each 

 other. 



MUSCLES OF THE SUPERIOR EXTREMITIES. 



Supra-spinatus arises from the basis, spine, and upper edge of the 

 scapula. Inserted into a large tuberosity at the head of the os 

 humeri. Use To raise the arm. 



Infra-spinatus arises from the cavity below the spine of the sca- 

 pula. Inserted into the upper part of the same tuberosity. Use 

 To roll the os humeri outwards. 



Teres minor arises from the inferior edge of the scapula. In- 

 serted into the greater tuberosity of the humerus. Use To assist 

 the former. 



Teres major arises from the inferior angle and edge of the sca- 

 pula. Inserted into the side of the groove for the long tendon of 

 the biceps. Use To assist in rotating the arm. 



Deltoides arises from the clavicle, and the acromion and spine of 

 fhe scapula. Inserted into the anterior and middle part of the os 

 humeri. Use To raise the arm. 



Coraco-brachialis arises from the coracoid process of the scapula. 

 Inserted into the middle and inner side of the os humeri. Use 

 To roll the arm forwards and upwards. 



Subscapularis arises from the basis, superior and inferior edge of 

 the scapula. Inserted into the protuberance at the head of. the os 

 humeri. Use To roll the arm inwards. 



