FIGURE 29 



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

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

 mediastinal trunk (37), and the jugular 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 azygos vein, thoracic portion. 



7 Aorta. 



11 Jugular lymph 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 External jugular vein. 



28 Cephalic vein. 



33 Subclavian artery. 



33' Subclavian vein. 



35 Thoracic duct, preazygos segment. 



36 Thoracic duct, azygos segment. 



37 Broncho-mediastinal duct. 

 40 Innominate vein. 



46 Left superior intercostal vein. 



52 Postazygos segment of thoracic duct. 



