ext jugular vein 



subclavian vein 

 Thoracic duct 



Sterno-mastoid 

 muscle 



Sterno 



masfoid 



muscle 



. int. jugular vein 

 Vagi nerves 



Carotid arteries 



To ether bottle 



To manometer 



Fig. 319. Dissection showing the method of isolating the thoracic duct at the root of 

 the neck. Care should be taken not to perforate the parietal pleura at the apex of the 

 chest if it can be avoided in making the dissection. 



