OF THE DIFFERENT MUSCLES. 141 



RHOMBOIDEUS LONGTJS. 



Origin. — From the side of the subrlavum, near its 

 attachment to the second cervical vertebra. 



Insertion and Use. — The same as the last described 

 muscle. 



LEVATOR HUMERI. 



Origin. — From the tubercle of the occiput, and mastoid 

 process of the temporal bone ; also from the transverse process 

 of the atlas, and third and fourth cervical vertebras. 



Insertion. — Into the fascia covering the muscles of the 

 shoulder blade : thence it is continued down tq, the body of 

 the os humeri. 



Use. — To raise and draw forwards the shoulder. When 

 both muscles act, they depress the head. 



MUSCLES OF THE NECK. 



SPLENIUS. 



Origin. — By tendinous fibres, and fleshy ones between 

 the occipital bone and the fifth dorsal spine. 



Insertion. — Into the transverse processes of the six lower 

 cervical vertebras ; also into the atlas and mastoid process of 

 the temporal bone. 



Use. — To erect and uphold the head when the pair act : 

 one contracting alone will incline those parts to one side. 



COMPLEXUS MAJOR. 



Origin. — By short tendinous slips, from the spines of the 

 four or five anterior dorsal vertebras ; also from the same pro- 

 cesses of the lower five cervical. 



Insertion. — Into the tubercle of the occipital bones, by 

 the side of the ligamentum subrlavum. 



Use. — To erect the head. 



