I 3 2 



HEAD AND NECK 



clean the branches of the external carotid, secure the internal 

 and external laryngeal branches of the superior laryngeal branch 

 of the vagus nerve. The internal branch will be found in the 

 posterfor part of the thyreo-hyoid interval below the greater 

 cornu of the hyoid bone and behind the posterior border of the 

 thyreo-hyoid muscle, beneath which it disappears. It is accom- 



orn posterior facial vein 

 Int. jugular vein 

 Hypoglossal ner 

 Posterior facial ye 

 Lesser occipital N, 

 Hypoglossal nerve 

 Great auricular N, 



Transverse 

 capular arterj 

 kl. scalenus an 



iiibclaviaii arti 

 Subclavian v< 



FIG 45. The Triangles of the Neck seen from the side. The clavicular head 

 of the sterno-mastoid muscle was small, and therefore a considerable part 

 of the scalenus anterior muscle is seen. 



panied by the laryngeal branch of the superior thyreoid artery. 

 The external branch is more difficult to find ; but if the superior 

 thyreoid artery and the upper part of the common carotid are 

 displaced posteriorly, the nerve will be found, lying deep to them, 

 in the fascia which covers the anterior part of the inferior con- 

 strictor muscle. 



Remove the fascia from the surface of the internal jugular 

 vein, which overlaps the anterior borders of the common 



