THE ANTERIOR PART OF THE NECK 233 



Next, clean the lingual artery and note its small supra-hyoid branch. The 

 external maxillary artery gives off no branches in the carotid triangle, but a 

 sterno-mastoid branch of the occipital artery will usually be found passing 

 downwards and posteriorly, superficial to the loop of the hypoglossal nerve. 

 Push the lower border of the parotid gland upwards, and immediately under 

 cover of it, at the level of the angle of the mandible, secure the accessory 



igastric 

 Nerve to thyreo-hyoid 



reo-hyoid 



uperior thyreoid artery 

 mo-hyoid 



Semispmahs capitis 

 Posterior auricular vein _ 

 Ext. jugular ve 

 Int. carotid art 

 Hypoglossal ne 



Transverse 

 . scapular artery 

 Scalenus anterior 

 bclavian artery. 



Suprascapular 



FIG. 94. 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. 



nerve, as it emerges from under cover of the posterior belly of the digastric 

 and crosses superficial to the internal jugular vein. It is sometimes accom- 

 panied by an additional branch to the sterno-mastoid from the occipital 

 artery. 



The floor or medial boundary of the carotid triangle is 

 formed by the upper part of the thyreo-hyoid muscle, the 



