256 



HEAD AND NECK 



much more restricted area. It commences in the posterior 

 mediastinum, where it not uncommonly communicates with 

 the thoracic duct ; and it ascends to the root of the neck on 



xternal jugular vein 



Platysma reflected with skin 

 Nervus cutaneus colli 



^ > Internal jugular vein 



X* 



\ Supra-clavicular 



Omo-hyoid 



Transverse cervica 

 vein 



Brachial plexus 



Scalenus anterior 

 Trans, cervical art 

 Trans, scapular art 

 Kxternal jugular v 

 Subclavius 

 Cephalic vein 

 Axillary vein 



Anterior jugular vein 

 Clavicular facet on sternum 



Left common carotid 



Left innominate vein 



irst rit 



Dome of left pleura 

 Thoracic duct 

 Internal mammary artery 

 Phrenic nerve 



FIG. 104. 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. 



the right side, where it terminates in the commencement of 

 the innominate vein by opening into it in the angle of union 

 of the subclavian and internal jugular veins. As in the case of 

 the thoracic duct, its orifice is guarded by a double valve. 

 Lymph passes to it from the intercostal glands which lie in 



