CARDIAC 



609 



Tlie subcostal vein, or twelfth thoracic vein, lies beneath tlie last rib, and 

 accompanies the twelfth dorsal or subcostal artery. It receives tributaries corre- 

 sponding to the branches of the subcostal artery, and opens on the; right side into 

 the vena azygos major, and on the left side into the vena azygos minor. 



The bronchial veins correspond to the bronchial arteries, but do not return the 

 wliolc of 'the blood carried to the lungs l)y those vessels — that part which is distri- 

 buted to the smaller bronchial tubes and the alveolae being brought back by thi' 

 pulmonary veins. The bronchial veins issue from the lung substance behind the 

 structures forming the root of the lung. The right vein generally joins the vena 

 azygos major just before the latter vein enters the superior vena cava. The left 

 vein opens into the lower left superior intercostal vein, or into the upper left azygos 

 vein. The bronchial veins at the root of the lung receive small trilnitaries from the 

 bronchial glands, from the trachea, and from the posterior mediastinum. 



The oesophageal veins from the thoracic portion of the oesophagus end in part 

 in the vena azygos major, and in part in the vena azygos minor. 



THE VEINS OF THE HEART 



The cardiac or coronary veins return the blood from the substance of the 

 heart. They accompany the corresponding coronary arteries, and terminate for the 

 most part in a dilated vein known as the coronary sinus. This opens directly into 



Fig. 383. — The Coronaky Sintts. 



Left carotid artery 

 Left subclavian artery 



Aorta 

 Ductus arteriosus 



Pulmonary artery 



Left pulmonary veins 



LEFT AURICLE 



Left coronary artery 



Left marginal artery 



Oblique vein of Marshall 



Left marginal vein 



PERICARDIUM 



Coronary sinus 



Posterior cardiac vein 



A nterior interventricular 

 branch of left coronary 



Hight carotid artery 



Innominate artery 



Vena cava superior 

 Right pulmonary veins 



KIGHT AURICLE 



— Vena cava inferior 



Hight coronary artery 

 Posterior interventricular vein 



Posterior interventricular branch 

 of right coronary 



the right auricle of the heart, V)etween the tricuspid opening and the opening of the 

 inferior vena cava. Some smaller veins from the heart's substance (vena? minima^ 

 cordis) open separately and directly into the right auricle at the bottom of some of 

 the small depressions "known as the foramina Thebesii. 

 39 



