MYOLOGY. 59 



Action. Inclines head on atlas. 

 Nerve. First cervical. 



POSTERIOR GREAT STRAIGHT OF HEAD. 



Origin. Spinous process of axis. 

 Insertion. To occipital behind complexus. 

 Action. Extends head. 

 Nerve. Deep cervical. 



POSTERIOR SMALL STRAIGHT OF HEAD. 



Origin. From superior face of atlas. 

 Insertion. Below preceding, on occipital. 

 Action. Same as preceding. 

 Nerve. Deep cervical. 



INFERIOR CERVICAL REGION. SUBCUTANEOUS OF NECK. 



Origin. Anterior prolongation of sternum and muscles of 

 chest. 



Insertion. Skin of neck raphe muscles of face, and zygo- 

 matic crest. 



Action. Braces muscles and pulls mouth backward. 



Nerve. Facial. 



MASTOIDO-HUMERALIS. 



Origin; Anterior Portion. Mastoid process and crest. 

 Insertion. Furrow of torsion of humerus below deltoid imprint. 

 Origin; Posterior Portion. Transverse processes of first four 

 cervical vertebrae. 



Insertion. With first portion. 



Action. Carries limb forward or inclines head to side. 



Nerve. Spinal accessory. 



STERNO-MAXILLARIS. 



Origin. Cariniform process of sternum. 

 Insertion. Posterior border of inferior maxilla. 

 Action. Flexes head or turns it to one side. 

 Nerve. Spinal accessory. 



STERNO-HYOID. 



Origin. Cariniform cartilage of sternum. 

 Insertion. Inferior surface of body of hyoid. 



