THE ARTERIAL SYSTEM. 45 



101. The right pneumogastric has a similar distribu- 

 tion ; its terminal gastric branches are very long, and 

 cross behind the heart to the dorsal side of the stomach. 



102. Divide the fibrous bands which pass between 

 the right lung and the right lobe of the liver, taking 

 great care not to prick the lung. Next push the right 

 liver-lobe over to the left side, and carefully separate 

 the lung from the muscles lying on the vertebral col- 

 umn. Then trace the right aorta ; it will be seen to 

 arch over the pulmonary vessels and the right bron- 

 chus, and to receive a communicating branch from the left 

 aorta, near the dorsal side of the visceral cavity and 

 opposite the fourth dorsal vertebra. From the point of 

 union, the dorsal aorta will be seen passing backward. 



103. Carefully divide, on the left side, the connective 

 tissue uniting the lung to the cardiac end of the 

 stomach, and the lung to the muscles on the dorsal ver- 

 tebrae, and trace the left aorta. Passing round the left 

 bronchus and pulmonary vessels to the dorsal side, it 

 ends by dividing into three main trunks, which are to 

 be traced successively by spreading out the mesentery 

 and pushing aside the viscera. 



104. The external division of the left aorta gives off : 

 a. The gastric artery, which runs a short way on 

 the dorsal aspect of the stomach and then bi- 

 furcates to form the right gastro- epiploic artery, 

 which runs along the great curvature of the 

 stomach ; and the coronary artery of the stomach, 

 which runs along the small curvature of that 

 organ. 



