176 SPECIAL HISTOLOGY. 



The bronchial arteries are distributed, firstly, to the greater 

 bronchia, whose vessels present the same conditions as those 

 of the trachea, then to the pulmonary veins and arteries, the 

 latter of which, in particular, possess an extremely rich, vascular 

 plexus, which may be traced as far as branches of J"' and less ; 

 lastly, to the pleura pulmonalis, the branches destined for which 

 are, some of them, given off even at the hilus and in the 

 fissures between the main lobes, some also from the vessels 

 accompanying the bronchia, coming out between the secondary 

 lobules. Small vessels, moreover, which are not derived from 

 the bronchial arteries, pass on the pulmonary ligaments to the 

 pleura. 



The lymphatics of the lungs are very numerous. The super- 

 ficial lymphatic vessels run in the subserous connective tissue 

 and in the interspaces between the larger and smaller lobules, 

 forming a superficial, finer, and a deep, coarser, angular net- 

 work, which covers the entire surface of the lungs, and on 

 the one hand empties itself into special, superficial trunks 

 accompanying the blood-vessels of the pleura towards the root 

 of the lung, and on the other, opens into the deeper vessels by 

 numerous trunks which penetrate between the lobules. These 

 arise from the walls of the bronchia and blood-vessels, particu- 

 larly those of the pulmonary arteries, running with those 

 canals through the substance of the lung, and through some 

 minute lymphatic glands (glandula pulmonales), towards the 

 root of the lung, in order, ultimately, to communicate with the 

 larger bronchial glands. 



The nerves of the lungs are derived from the vagus and 

 sympathetic, form the more scanty plexus pulmonalis anterior, 

 and the richer plex. p. posterior, and are distributed principally 

 with the bronchia and the pulmonary artery, occasionally, 

 however, accompanying the pulmonary veins and vasa bron- 

 chialia. In the interior of the lung they are also furnished 

 with microscopic ganglia, and may be traced nearly to the ter- 

 mination of the bronchia. 



[It is very remarkable, that besides the air-cells, some other 

 parts of the lungs are also supplied by the vasa pulmonalia, 

 such as the surface of the lungs and the finer bronchia. With 

 respect to the former, even in uninjected lungs, minute ramus- 



