354 MUSCLES OF THE BACK AND NECK. 



Use. To draw the head backwards, and to one side, and 

 when both act, to draw the head directly backwards. 



N. B. The long portion of this muscle that is situated next 

 the spinous processes, lies more loose, and has a roundish tendon 

 in the middle of it : for which reason Albinus calls it biventer 



cervicis. 







2. Trachelo-Mastoideusj 



Arises from the transverse processes of the three uppermost 

 vertebrae of the back, and from the five lowermost of the neck, 

 (where it is connected to the transversalis cervicis,) by as many 

 thin tendons, which unite into a belly, and run up under the 

 splenius. 



Inserted into the middle of the posterior side of the mastoid 

 process, by a thin tendon. 



Use. To assist the complexus ; but it pulls the head more 

 to one side. 



3. Levater Scapulae, 



Arises, tendinous and fleshy, from the transverse processes 

 of the five superior vertebrae of the neck, by as many distinct 

 slips, which soon unite to form a muscle that runs downwards 

 and outwards. 



Inserted, fleshy, into the superior angle of the scapula. 



Use. To pull the scapula upwards and a little forwards. 



The fourth layer consists of two pair* on the back, two on 

 the posterior part of the neck, four small pair situated immedi- 

 ately below the posterior part of the occiput, and three on the 

 side of the neck. 



On the back are, 



1. Scmi-Spinalis Dorsi, 



Arises, from the transverse processes of the seventh, eighth, 

 ninth, and tenth vertebrae of the back, by as many distinct 

 tendons, which soon grow fleshy, and then become tendinous : 

 and are 



Inserted into the spinous processes of all the vertebrae of 



