OP THE DIFFERENT MUSCLES. 143 



ANTERIOR CERVICAL REGION. 



STERNO-MAXILLARIS. 



Origin. — Fleshy and tendinous, from the cartilage project- 

 ing in front of the sternum. Its belly is compact, rounded, 

 and of inconsiderable breadth in comparison to its length. 

 About three fourths of its length upwards, it terminates in a 

 flat tendon, which insinuates itself between the parotid and 

 submaxillary glands. 



Insertion. — Into the angle of the posterior jaw. 



Use. — To draw the head towards the chest. They also 

 assist the occipito-maxillaris in opening the mouth. 



STERNO-THYRO-HYOIDEUS. 



These muscles are said to clothe the upper and front parts 

 of the trachea. 



Origin. — From the front cartilage of the sternum, above 

 the sterno-maxillaris. 



Insertion. — The main part of this muscle, having crossed 

 the front of the larynx, is inserted into the neck or spur of 

 the body of the os hyoides. A small tendon is also fixed in 

 the lower border of the thyroid cartilage. 



Use. — To draw the os hyroides, and larynx with it, down- 

 wards and backwards. 



SCALENUS. 



Origin. — From the middle of the first rib. 

 Insertion. — Into the bodies and transverse processes of the 

 fifth and sixth cervical vertebrae. 

 Use. — To straighten the neck. 



RECTUS CAPITIS ANTICUS MAJOR, MINOR, OBLIQUE, AND LONGUS COLLI, 



Are all inserted into the occipital region, and assist in flex- 

 ing and bending the head. The latter muscle, in addition to 

 its insertion into the body of the atlas, is also inserted into 

 the transverse processes of the six posterior cervical vertebras. 



