248 



HEAD AND NECK 



extremity. It arises differently on the two sides of the body. 

 On the right side it takes origin behind the sterno-clavicular 

 articulation from the bifurcation of the innominate artery. 



Sterno-hyoi 



Hiri 



1 y/7 



Sympathetic '7f 



Inferior constrictor^^! fjf^'' /V,^ 



Thyreoid gland i jar/ 

 dragged forwards-J^M 



^External 

 carotid artery 

 'internal jugular vein 

 Scalenus meclius 



Inferior thyreoid 

 artery 



Inferior laryngea 



nerve 



(Esophagus 



Common carotid 

 artery 



Internal jugular vei 



nferior" thyreoid vein 



Innominate artery 



'Longus capitis 

 Vagus nerve 

 Phrenic nerve 

 Vertebral vessels 

 Scalenus anterior 

 Dome of pleura 



Brachial nerve 



.Subclavian 

 vessels 



.nsverse scapular and 

 cervical arteries 

 THORACIC DUCT 

 Pleura 

 Internal mammary artery and phrenic nerve 



Left innominate vein 



FIG. 102. Deep Dissection of the Root of the Neck on the Left Side to show 

 the Dome of the Pleura and the relations of the Terminal Part of the 

 Thoracic Duct. The sterno-mastoid and the depressors of the hyoid and 

 larynx have been removed. 



On the left side it arises from the aortic arch in the superior 

 mediastinum. In both cases it takes an arched course 

 laterally across the root of the neck, posterior to the scalenus 

 anterior and on the anterior surface of the cervical dome of 



