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On the right side the posterior mediastinal pleura passes inwards in front of the 
vertebree, forming a slight cul-de-sac between them and the cesophagus. On the /eft 
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Fic. 803.—PosTERIOR ASPECT OF TRUNK, SHOWING SURFACE TOPOGRAPHY OF VISCERA. 
T. Trachea. Sp. Spleen. P. Pancreas. 
A. Aorta. 1b}. Liver. Pl. Pleura. 
L.L. Left lung. S.R. Suprarenal body. D.C. Descending colon. 
R.L. Right lung. L.K. Left kidney. A.C, Ascending colon. 
St. Stomach. RK, 
Right kidney. R. Rectum. 
side the posterior mediastinal pleura passes from the lateral aspect of the bodies of the 
vertebrie on to the left side of the aorta. Hence, to evacuate pus from the posterior 
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