GLANDS. 97 



slices, where they unite with each other to form 

 larger branches, which finish their course afterwards, 

 either alone, or by joining company with branches of 

 the pulmonary artery. 



The bronchial arteries supply the whole bronchial 5 nchial a 

 tree, and also the pleurae. Some of their terminal 

 branches, those which supply the smallest of the 

 bronchial canals, anastomose with branches of the 

 pulmonary arteries and veins ; others terminate by 

 corresponding veinules* through which their blood is 

 ultimately brought back to the vena cava superior. Lymphatics 



The lymphatics of lungs form two sets, one of which 

 is superficial, ramifying upon the pleurae, and the 

 other deep, and accompanying the bronchi and large 

 vessels. In the intervals between the lobules nume- 

 rous anastomoses take place between these two sets 

 of vessels, both of which ultimately reach the bron- 

 chial glands at the roots of the lungs. Lymphatic 

 glands have never as yet been discovered in the 

 parenchyma of the lungs. 



The nerves of the lungs are derived from the pneu- Nerves. 



* The existence of bronchial veins within the lungs is denied by Wa- 

 ters (op. cit.), whose original investigations entitle his opinions to respect. 

 At p. 405, under the head of bronchial veins, he says, " The only vessels 

 I have been able to discover to which this name can be applied, are some 

 small ones situated at the root of each lung, at its posterior aspect. I 

 have previously mentioned that thgir distribution has always appeared to 

 me to be confined to the structures about the root of the lung, the bron- 

 chi, the bronchial glands, &c. ; and that they do not return the blood 

 from the interior of the lung. I have never seen, either in the lungs of 

 man, or those of other mammalia I Jiave examined, any veins accompany 

 the several branches of the bronchial artery along the bronchial tubes'' 1 

 Keisseissen (de fab. Pulmonum, Berlin, 1823) appears to hold the same 

 view. (Ed.) 



