FIGURE 29 



29 Color schema, showing the four genetic segments of the thoracic ducts (I, 

 II, III, IV) in the cat, and their rehitions to the embryonal veins, the broncho- 

 mediastinal trunk (37), and the juj^ular lymph sacs (II). 



3' Precardinal or precava of right side. 



3 Right azygos vein, thoracic portion. 



6 Precardinal or precava of left side. 

 6' Left azj^gos vein, thoracic portion. 



7 Aorta. 



11 Jugular lympli sac. 



12 Jugular lymph sac, thoracic duct approach. 



13 Jugular lymph sac, jugular approach. 



14 Jugular lymph sac, subclavian approach. 



24 Thyrocervical artery. 



25 Internal jugular vein. 



26 Common jugular vein. 



27 I^xternal jugular vein. 



28 Cephalic vein. 



33 Subclavian arterj\ 



33' Subclavian vein. 



3") Thoracic duct, preazygos segment. 



30 Thoracic duct, azygos segment. 

 37 Broncho-mediastinal duct. 



40 Innominate vein. 



46 Left superior intercostal vein. 



52 Postazygos scgiiicnt of thoracic duct. 



