THE EMBRYOLOGY/ OF THE BIRD S LUNG 



23 



our injected specimens tlie pulmonary vein takes the injection 

 before the artery as shown in figure 6, part I. This injected 

 specimen gives a view of the ]:)ulmonary veins as seen from the 

 ventral aspect of the lung. A single well defined blood vessel 



Ect. 1 - 



Ect. 6 



Fig. 55 Diagram of the dorso-lateral aspect of the adult lung. Exhibits 

 openings into the mesobronchus of the dorsobronchi {Dor.) as seen when their 

 stems are severed. 



Ect. 6 



Ent. 4 Ent. 3 Ent. 2Ent. 1 



Fig. 56 Diagram of the mesial face of the adult lung to show parabronchi 

 connecting ento- and ectobronchi. 



