146 SPECIAL ANATOMY. 



235. 4. Transversalis cervicis. 



Pos.: external to and (above) before the last; united below 

 with m. longissimus dorsi. Or. : Vv. eighth to the fourteenth 

 proc. transv. Vv. fourth to the seventh proc. obliq., with seven 

 fasciculi. Ins. : Vv. second to the sixth proc. transv. Use : to 

 incline the neck sideways. 



236. 5. Cervicalis descendens. 



Pos. : lateral in the neck, before the last muscle, and behind 

 muse, scalen. post. Or.: Vv. fourth to the sixth proc. transv. 

 Ins. : costse third to the sixth (the superior border, opposite the 

 angle). Use: to draw the neck sideways; or raise the third to 

 the sixth ribs. 



Nerves : rr. posterr. nn. cervicall. (from the first to the fifth). 



237. 6. Longissimus dorsi. 



Fig. : three-sided, below thick. Pos.: external to spinal, dorsi, 

 internal to ilio-costalis, behind multifid., semispinalis, levator. 

 costar., covered by fas c. ilio-dorsal and serrati postici, along the 

 vertebral column, the neck excepted. Or. : tendinous from proc. 



r'n. of Sacrum and the three inferior lumbar vertebrae, fleshy 

 m the posterior part of fossa ovalis oss. ilei. Ins. : a. internal 

 fasciculi to the lumbar vertebras and proc. transv. of all the dor- 

 sal; b. external fasciculi to the proc. transv. of all the lumbar 

 vertebrae and to the twelfth- to the second ribs (the lower border). 

 Use : to extend the lumbar and dorsal portions of the vertebral 

 column, drawing the chest downwards. 



238. 7. Ilio-costalis (s. sacro-lumbalis). 



Fig. : long. Pos. : upon the longiss. dors, external to it, on 

 the lumbar vertebrae and behind the ribs, ascending internally to 

 angul. cost.; covered posteriorly by/asc. lumbo-dorsal. and 

 serrati postic. Or.: a. labium extern, crist. ilei; b. from the 

 origin of longiss. dorsi on the third to fifth lumbar vertebrae ; c. 

 from the sixth to the seventh inferior ribs (superior border). Ins. : 

 first to twelfth ribs (inf. border of angle). Use : to draw the ribs 

 downwards. The continuation forms cervical, descendens. [The 

 origins, c, pass, also, under the name of musculi accessorii ad 

 sacro-lumbalem.~\ 



Nerves : (sixth to the seventh) rr. postt. nn. intercostt. and lumball. 



D. Fourth layer. 

 Origins : proc. spinos. or transv. Ins. : proc. spinosi. 



