SLBCLAVIAN ARTERY RELATIONS. 



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Plan of the Relations of the First Portion of the Right Subclavian Artery 



In Front. 



Internal jugular vein, 

 Subclavian vein, 

 Pneumogastric nerve, 

 Cardiac nerves, 

 Phrenic nerve. 



Right Subclavian Artery. 



Behind and Beneath. 



Pleura, 

 Recurrent laryngeal nerve, 



Vertebral vein, 

 Transverse process of the 7th cervical vertebra. 



Plan of the Relations of the First Portion of the Left Subclavian Artery. 



In Front. 

 Pleura, 



Vena innominata, 

 Pneumogastric nerve, 

 Phrenic nerve, 

 Left carotid artery. 



Inner Side. 

 (Esophagus. 



Left Subclavian Artery. 



Outer Side. 

 Pleura. 



Behind. 



Thoracic duct, 

 Longus colli, 

 Vertebral column. 



The Second portion is situated between the two scaleni, and is supported 

 by the margin of the first rib. The scalenus anticus separates it from the 

 Subclavian vein and phrenic nerve. Behind, it is in relation with the 

 brachial plexus. 



The Third portion is in relation, in front, with the Subclavian vein and 

 subclavius muscle ; behind, with the brachial plexus and scalenus posti- 

 cus ; below with the first rib ; and above with the supra-scapular artery 

 and platysma. 



Plan of the Relations of the Third Portion of the Subclavian Artery. 



Jlbove. 



Supra-scapular artery, 

 Platysma myoides. 



In Front. 



Subclavian vein, 

 Subclavius. 



Subclavian artery, 

 Third portion. 



Behind. 



Brachial plexus, 

 Scalenus posticu* 



Below. 

 First rib. 



