Muscles of the Back. 



171 



225. The Long Muscles 

 of the Back. 



M. complexus major (Fig. 224) 

 arises by seven tendinous slips from 

 the transverse processes of the four 

 lower cervical and three upper dorsal 

 vertebrae and the articular processes 

 of the 3. 6. cervical vertebrae; 

 Inscriptiones tendineae. It is inserted bet- 

 ween the superior and inferior curved 

 lines of the occipital bone. (Draws 

 the head backwards.) 



M. trachelo-mastoidcMS s. complexus 

 minor (Fig. 224) arises from the trans- 

 verse and articular processes of the 

 four lower cervical and three upper 

 dorsal vertebrae, and is inserted into 

 the posterior margin of the mastoid 

 process. (Draws the head backwards 

 and rotates it.) 



M. spinalis dorsi (Fig. 224) arises 

 from the spinous processes of the two 

 upper lumbar and three lower dorsal 

 vertebrae , and is inserted into the 

 spinous processes of the VIII. II. dor- 

 sal vertebrae. (Extends the spinal 

 column and head.) 



M. semispinalis dorsi arises from the 

 transverse processes of the VI. XI. 

 dorsal vertebrae. It is inserted by six 

 tendons into the spinous processes of 

 the 7. cervical and five upper dorsal 

 vertebrae. (Produces lateral flexion of 

 the spinal column and rotates it.) 

 M. spinalis cervicis s. colli (not illustra- 

 ted) arises from the spinous processes of 

 the lower cervical and upper dorsal ver- 

 tebrae, and is inserted into the spinous 

 processes of the upper cervical verte- 

 brae, excepting the atlas. (Extends.) 



M. semispinalis cervicis s. colli arises 

 from the transverse processes of the 

 upper dorsal vertebrae, being inserted 

 by four tendinous slips into the spinous 

 processes of the 2. 5. cervical ver- 

 tebrae. 



M.compL. 

 minor 



