THE MUSCLES. 147 



239. 1. Spinalis dor si. 



Pos. : between proc. spin, and longiss. dor si ; upon multi- 

 fidus, covered by serrati post. Or. : TV. seventeenth to the 

 twenty-first proc. spin. Ins. : TV. fifteenth to the ninth proc. 

 spinos. Use : to extend the back. 



240. 2. Spinalis cervicis. 



Pos.: in the neck, close to proc. spin. Or.: TV. eighth to 

 the ninth proc. spin. Ins. : TV. third to the second proc. spin. 

 Use : to extend the neck. 



241. 3. Semispinalis dor si. 



Pos. before m. longissim. ; behind multifid.; below and in- 

 ternal: spinal, dor si; above and external: semispinal. and bi- 

 venter cervicis. Or. : TV. thirteenth to the eighteenth proc. trans. 

 Ins. : TV. tenth to the fifth proc. spin. Use: to draw the back 

 obliquely backwards. 



242. 4. Semispinalis cervicis (s. colli). 



Pos. : before m. biventer, behind multifidus. Or. : TV. eighth 

 to twelfth proc. transv. Ins. : TV. fifth to the second proc. spin. 

 Use : to draw the neck obliquely downwards and backwards. 



243. 5. Levatores costarum s. supracostales. 



a. breves, twelve. 



Pos. : before m. longiss. dors, and ilio-costal., and cervic. de- 

 scend., behind the diaphragm in the post, part of the intercostal 

 spaces. Or. : TV. seventh to the eighteenth proc. transv. Ins. : 

 Costse, first to the twelfth (the superior border of the posterior 

 part). Use : to draw the ribs backwards and upwards. 



b. longi, four. 



Or. : Seventh to the tenth proc. transv. Ins. : ninth to the 

 twelfth ribs. 



Nerves: rr. postt. nn. cervicall. and dorsall. (from first to the fifth). 



E. Fifth layer, 



close upon the vertebral column in the spaces between the pro- 

 cesses. Small muscles. 



244. 1 . Rectus capitis post, major. 



Pos. : before complexus upon the post, arch of the Atlas. Or. : 

 Proc. spin, epistroph. (dentatus). Ins.: Linea semicircular, 

 infer. 1" broad, near the middle line. Use : to extend the head. 



