MUSCLES OF THE NECK. 191 



RECTUS LATERALIS. 



Origin Transverse process of atlas. 

 Insertion Jugular process of occipital. 

 Nerve Suboccipital. 



LONGUS COLLI. 



Origin Three portions: (1) superior oblique, from 

 anterior tubercles of transverse processes of third, 

 fourth, and fifth cervical vertebrae ; (2) inferior 

 oblique, from anterior tubercles of transverse proc- 

 esses of fifth and sixth cervical vertebrae ; (3) ver- 

 tical portion, from bodies of upper three dorsal 

 vertebrae and lower two or three cervical. 



Insertion Superior oblique portion passes upward 

 and is inserted into anterior tubercle of atlas. In- 

 ferior oblique portion passes downward, and is 

 inserted into the bodies of first and second dorsal 

 vertebrae. Vertical portion, into the bodies of the 

 second, third, and fourth cervical. 



Nerves Cervical and brachial plexuses. 

 SCALENUS ANTICUS. . 



Origin Anterior tubercle of the transverse process of 

 the third, fourth, fifth, and sixth cervical vertebrae. 



Insertion Passes downward and outward, and is in- 

 serted on the tubercle on the first rib, between 

 the grooves for the subclavian vein and artery. 



Nerve Cervical plexus. 

 SCALENUS MEDIUS. 



Origin Posterior tubercles of transverse process of 

 all the cervical vertebrae except the atlas. 



Insertion On first rib, behind groove for subclavian 

 artery. 



Nerves Cervical and brachial plexuses. 

 SCALENUS POSTICUS. 



Origin Posterior tubercles of sixth and seventh cer- 

 vical vertebrae. 



