FCETAL AND INJECTED LUNG. 67 



Foetal lung". Man. ( p . 14 (b), s. 22, c. P., m. B .) (L) The 

 subdivision of the lung into lobules attached centrally to the 

 larger bronchi. Between the former note the loose interlobular 

 connective tissue continuous with the pleural tissue on the 

 surface of the lung. In the lobules the ramifications of the 

 air passages are discernible. (H) The pleural and interlobular 

 connective tissue exhibit blood vessels and numerous lymphatics. 

 The branchings of the incompletely developed bronchi can be 

 synthetically followed to their terminations, which may not 

 however be sufficiently developed to present air vesicles, but 

 merely the blind terminations of the bronchioles. Note the 

 large amount of interstitial connective tissue. 



Injected Lung. Mount a section of lung the blood-vessels 

 of which have been filled with a coloured gelatin mass. 

 (L) Find the large pulmonary vessels filled with the coloured 

 mass and (If) recognise the injected capillaries which form 

 a close network in the walls of the air vesicles. 



