MUSCLES OF THE BACK. 197 



SPLENIUS CAPITIS ET COLLI. . 



Origin Lower half of ligamentum nuchae, spine of 

 seventh cervical, spine of six upper dorsal vertebrae. 



Insertion Passes upward and divides ; the outer 

 division is inserted into the mastoid portion of the 

 temporal, the inner into the posterior tubercles of 

 transverse processes of second, third, and fourth 

 cervical vertebrae. 



Nerves Posterior branches of dorsal and cervical 

 nerves. 



Muscles of the Fourth Layer. 

 ERECTOR SPIN^E. 



Origin The mass of muscle filling in the grooves 

 at the side of the spines of the vertebrae in the 

 lumbo-sacral region. It arises from the sacro-iliac 

 groove, spines of lumbar vertebrae, posterior surface 

 of sacrum, posterior one-third of inner lip of crest 

 of ilium. 



Insertion Passes upward ; divides into the sacro- 

 lumbalis and longissimus dorsi. 



Nerves Lumbar and dorsal. 

 SACROLTJMBALIS. 



Origin From erector spinae (outer division). 



Inserted by six tendons into angles of six lower ribs. 



Nerves Dorsal. 

 ACCESSORY, or MUSCULUS ACCESSORIUS AD SACROLUM- 



BALEM. 



Origin From six tendinous insertions of sacrolum- 



balis 



Inserted by tendons into angles of six upper ribs. 

 Nerves Dorsal. 

 CERVICALIS ASCENDENS. 



Origin From four upper tendons of insertion of the 



accessory muscle. 



