POSTERIOR TRIANGLE 



33 



The anterior and middle supra-clavicular nerves will be found 

 piercing the deep fascia immediately above the clavicle, the 

 anterior at the posterior border of the sterno-mastoid and the 

 middle above the convexity of the clavicle. They descend into 

 the pectoral region as far as the lower border of the second rib 



Greater occipital 



nerve . 

 Posterior 

 auricular vein 



Lesser occipital nerve 

 Great auricular nerve 

 M. splenius capitis 

 Accessory nerve 



Middle supra- 

 clavicular nerve 

 Posterior supra- 

 clavicular ne 



M. scalenus medius 



" Nervus cuta- 

 neus colli, 

 upper branch 

 Exteinal jugular 

 vein crossing nervus 

 cutaneus colli 



Anterior supra- 

 clavicular nerve. 



FIG. ii. The superficial branches of the Cervical Plexus. 



and their lower portions will be displayed by the dissector of the 

 arm. The posterior supra - clavicular nerves pierce the deep 

 fascia at a somewhat higher level. They descend across the 

 lower and anterior part of the trapezius to the acromial region, 

 and to the skin of the arm over the proximal part of the deltoid, 

 where they will be exposed by the dissector of the arm (Fig. 1 1 ) . 



VOL. Ill 3 



