THYMUS GLAND. 



Seventh ring of trachea. 

 Right carotid artery. 



Right subclavian artery. 

 Right innominate vein. 



Thymus gland. 

 Vena cava superior. 



Arch of aorta. 



Thyroid cartilage. 



Central portion of crico- 

 thyroid membrane. 

 - Crico-thyroid muscle. 

 First ring of trachea. 



Thyroid body. 



Ligament connecting 

 thyroid and thymus 

 bodies. 



Left carotid artery. 



Left subclavian artery. 



Lobe of thymus passing 

 behind vein. 



Left innominate vein. 



Arch of aorta. 



FIG. 40. Thymus gland in a child at the age of two years showing some 

 important relations. (From Morris's Anatomy.) 



[To face pa.ge 295. 



