MYOLOGY. 59 



Action. — Inclines head on atlas. 

 Nerve. — First cervical. 



POSTERIOR GREAT STRAIGHT OF HEAD. 



Origiii. — 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. 

 Actioti. — Same as preceding. 

 Nerve. — Deep cervical. 



INFERIOR CERVICAL REGION, — SUBCUTANEOUS OF NECK. 



Origin. — Anterior prolongation of sternum and muscles of 

 chest. 



Inserti.on. — Skin of neck — raphe — muscles of face, and zygo- 

 matic crest. 



Action. — Braces muscles and pulls mouth backward. 



Nertw. — 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 inchnes head to side. 



Nerve. — Spinal accessory. 



STERNO- MAXILLARIS. 



Oi'igin. — Cariniform process of sternum. 

 Insertion. — Posterior border of inferior maxilla. 

 Action. — Flexes head or turns it to one side. 

 Nerve. — Spinal accessory. 



STERNO- HYCID. 



Origin. — Cariniform cartilage of sternum. 

 Insertion. — Inferior surface of body of hyoid. 



