MUSCULAR SYSTEM OF THE RED HOWLING MONKEY 



57 



the body of the upper three thoracic and last cervicals and pass 

 cranially along the sides of the anterior longitudinal ligament to be 

 attached on the bodies of the upper five cervical vertebrae. 



M. rectus capitis anterior: Its rectangular belly is deep to other 

 subvertebral muscles. Origin is on the basilar process of the occipital 

 immediately in front of the brim of the foramen magnum (fig. 5) 

 and insertion is on the ventral aspect of the lateral masses of the atlas. 



M. rectus capitis lateralis: This is a strong and cylindrical muscle 

 with origin from the jugular process of the occipital and adjacent 

 l)etrous surface (fig. 5). Its fibers reach the lateroventral aspect of 

 the lateral mass where they are inserted on the transverse crest and 

 its extension into the transverse process. 



M.^.S. 



Figure 19. — Subvertebral muscles in the neck (1, m. rectus capitis anterior; 2, m. longus 

 colli, pars obliqua superioris; 3, m. longus colli, pars vcrticalis;4, m. longus colli, pars obliqua 

 inferioris; 5, m. serratus anterior, pars cranialis; 6, m. longus capitis; 7, m. atlantoscapu- 

 laris posterior). 



