SUBCLAVIAN ARTERY. RELATIONS. 



315 



and subclavius muscle ; behind with the brachial plexus and scalenus 

 posticus ; below with the first rib ; and above with the supra-scapu- 

 lar artery and platysma. 



Plan of the relations of the third portion of the Subclavian Artery. 



Above. 



Supra-scapular artery, 

 Platysma myoides. 



In Front. 

 Subclavian vein, 

 Subclavius. 



Subclavian artery, 

 Third portion. 



Behind. 



Brachial plexus. 

 Scalenus posticus. 



Below. 

 First nb. 



Brandies. The greater part of the branches of the subclavian are 

 given off from the artery before it arrives at the margin of the first 



Fig. 118.* 



* The branches of the right subclavian artery. 1. The arteria innominata. 

 2. The right carotid. 3. The first portion of the subclavian artery. 4. The 

 second portion. 5. The third portion. 6. The vertebral artery. 7. The in- 

 ferior thyroid. 8. The thyroid axis. 9. The superficial cervicis. 10. The 

 profunda cervicis. 11. The posterior scapular or transversalis colli. 12. 

 The supra-scapular. 13. The internal mammary artery. 14. The superior 

 intercostal. 



