ANATOMY IX A NUTSHELL. 



287 



and pneumogastric nerve. The internal jugular vein lies external to the artery 

 while the pneumogastric nerve is between the internal jugular vein and com- 

 mon carotid artery but on a plane posterior to them. Occasionally a thyroid 

 branch passes from this artery. 



The Relations of the Left Common Carotid Artery in the thorax is as fol- 

 lows: 



Ix Front. — (1) Sternum, (2) Sterno-hyoid and (3) Sterno-thyroid muscles. 



PLATE CXX. 



SUPERIOR CORNU OF 



THYROID CARTILAGE 



CRICOID CARTILAGE 



The Trachea. 



(4) Left innominate vein, (5) Remains of thymus gland. 



Behind.— (1) Trachea. (2) Oesophagus, (3) Thoracic duct. (4) Left sub- 

 clavian artery. 



Internally. — (1) Innominate artery, (2) Inferior thyroid veins. (3) 

 (3) Remains of thymus gland. 



Externally. — (1) Left pneumogastric nerve, (2) Left pleura, (.'!) Left 

 lung. (4) Left subclavian artery. 



