BRONCHIAL AND (ESOPHAGEAL* ARTERIES. 281 



Of the Branches which go off between the Arch and the great 

 Bifurcation of the Aorta. 



PART 1. 



In the Cavity of the Thorax. 



The aorta while in the cavity of the cheek sends branches to 

 the pericardium, lungs, to the oesophagus, and to the parietes of 

 the thorax. 



The Pericardial Branches, 



Are some small and very irregular vessels which are directed 

 forwards and ramify on the pericardium and posterior medias- 

 tinum. . 



The Bronchial Arteries 



Are the vessels which go from the aorta to the ramifications 

 of the trachea, and the substance of the lungs. They are not 

 large, and are very irregular as to their number and origin. 



In a majority of cases the right lung is supplied, in part, by 

 a branch from the first aortic intercostal of that side ; while the 

 left lung receives two or three branches from the aorta directly. 

 In some cases a large vessel arises from the aorta, which divides 

 into two branches, one of which goes to each lung. 



The Bronchial arteries frequently send small branches to the 

 posterior mediastinum, the pericardium, &c. 



Injections have shown, that there is a direct communication 

 between these vessels and the branches of the pulmonary 

 artery. 



They are the proper nutritious arteries to the substance of the 

 lungs and accompany the ramifications of the bronchia. 



The (Esophageal Arteries 



Are very small vessels, which generally arise from the aorta, 

 but sometimes are branches of the bronchials or intercostals 

 that are spent upon the ossophagus. They occur in succession, 

 24* 



