MUSCLES OF THE BACK AND NECK. 357 



3. Obliquus Capitis Superior. 



Arises from the transverse process of the first vertebra of the 

 neck. 



Inserted, tendinous and fleshy, into the os occipitis behind 

 the back part of the mastoid portion of the temporal bone, and 

 under the insertion of the complexus muscle. 



Use. To draw the head backwards. 



4. Obliquus Capitis Inferior. 



Arises, fleshy, from the spinous process of the second verte- 

 bra of the neck, its whole length ; and, forming a thick fleshy 

 belly, is 



Inserted into the transverse process of the first vertebra of 

 the neck. 



Use. To give a rotary motion to the head. 



On the side of the neck are, 



1. Scalenus Anticus, 



Arises from the fourth, fifth, and sixth transverse processes of 

 the first vertebra of the neck, by as many tendons. 



Inserted, tendinous and fleshy, into the upper side of the first 

 rib near its cartilage. 



2. Scalenus Medius, 



Arises from all the transverse processes of the vertebra of the 

 neck, by as many strong tendons ; the nerves to the superior 

 extremity pass between it and the former. 



Inserted into the upper and outer part of the first rib, from its 

 root, to within the distance of an inch from its cartilage. 



3. Scalenus Posticus, 



Arises from the fifth and sixth transverse processes of the 

 vertebrae of the neck. 



Inserted into the upper edge of the second rib, not far from 

 the spine. 



Use of the three scaleni ; to bend the neck to one side ; or, 



