144 SPECIAL ANATOMY. 



shoulder down, rolling the arm inwards and behind (m. aniscalp- 

 tor) ; draws the arm, when raised, downwards, or the trunk to- 

 wards it, or expands the thorax. 



Nerves : dorsales, lumbales, and sacrales. 



B. Second layer. 



223. Seven muscles ; some covering others. Origin : Proc. 

 spinosi (except m. levator anguli scapulas). Direction of fibres 

 from within, outwards. 



224. 1. Splenius capitis. 



Pos. : oblique upwards and outwards, covered by m. cucullaris 

 and sterno-cleido-mast. Above, before it: trachelo-mastoid., 

 complexus, biventer from without, inwards. Or. : Lig. nuchae 

 (third to the sixth vert.) ; proc. spin. (vv. seventh to the eighth). 

 Ins. : Proc. mastoideus below m. sterno-cleido-mast. ; and be- 

 low Linea semicircular, superior. Use : to rotate the head, so 

 that the face looks towards the same side; both acting together 

 draw it directly backwards. 



225. 2. Splenius- colli. 



Pos. : close to the outer side of the last muscle ; covered by 

 cucullar. and serrat. post. sup. Or. : Vv. 10 to 12 proc. spin. ; 

 connected with the last muscle. Ins.: Vv. first to third proc. 

 transv. Use : to draw the neck (also atlas and head) towards its 

 own side ; both extend the neck. 



226. 3. Levator anguli scapulas. 



Pos.: outside the last; above, covered by sterno-cleido-mast. 

 besides by trapezius. Or. : Vv. 1 to 4 proc. transv. (3 to 4 

 heads) external to the splenius colli, behind the scalen. post. 

 Ins. : Scapulas angulus superior (between rhomboidei and serrat. 

 magn). Use : to elevate the internal superior angle of the scapula 

 (to shrug the shoulders). 



227. 4. Rhomboideus superior s. minor. 



Pos. : transverse between vertebras and scapula. 



Or. : Vv. 6 to 7 proc. spinosi (lig. nuchas). Ins. : Bas. sca- 

 pulas labium externum (the superior part). Use : to draw the 

 scapula inwards and upwards. 



228. 5. Rhomboiaeus inferior s. major. 



Pos.: below the last m. in a similar direction. Or.: Vv. 11 

 to 13 proc. spinosi. Ins.: Bas. scapulse lab. extern, (the infe- 





