VEINS 103 



innominata. Separated from its artery by scalenus anticus 

 muscle and phrenic nerve. Receives external and anterior 

 jugular veins. [Valves just external to entrance of external 

 jugular, or about i inch from its termination.] 



VEINS OF THE BODY. 



Innominate : two large trunks, placed one on each side of 

 the neck, and formed by the junction of the internal jugular 

 and subclavian veins of the corresponding side. They end 

 by uniting to form the superior vena cava. No valves. 



The right innominate vein is short (i inch long), and, com- 

 mencing behind the inner end of the clavicle, passes down- 

 wards to join left innominate at the inferior border of ist 

 right costal cartilage. Receives the right vertebral, right 

 internal mammary, right inferior thyroid, and right superior 

 intercostal veins. The right lymphatic duct opens at the 

 angle of union of right subclavian and internal jugular veins. 



Relations : 



In Front. Behind. 



Right sterno-hyoid. Right pleura and lung. 



Right sterno-thyroid. 

 Clavicle. 



ist costal cartilage. 

 Thymus. 



Left Side. Right Side. 



Innominate artery and right Right lung and pleura, 



pneumogastric nerve. Right phrenic nerve. 



The left innominate is 3 inches long, passes from left to right 

 and downwards. The thoracic duct opens at the angle of 

 union of the left subclavian and internal jugular veins. 



'left vertebral, 

 left internal mammary, 

 left inferior thyroid. 



The left innominate vein receives-; left superior intercostal. 



thymic. 

 mediastinal. 

 pericardiac. 

 Relations : 



In Front. Below. 



First piece of sternum. Arch of aorta (transverse part). 



Origin of left sterno-hyoid. , . , 



Origin of left sterno-thyroid. **** 



Thymus gland. Innominate artery. 



Left ca otid artery. 

 Left subclavian artery. 

 Left phrenic nerve. 

 Left pneumogastric nerve. 



