396 The Vascular Supply of the Pleura Pulmonalis 
Along the margo inferior certain of the arteries instead of arching over 
the margin turn and enter one of the septa of the lung and, passing 
along this, appear on the facies costalis. Several of such examples are 
shown in Fig. 5. 
pees 
Fic. 5. Facies costalis of the lung shown in Fig. 4. B. = bronchus sinister. 
L. s.=lobus superior. UL. 7.=TIobus inferior. J. i.=incisura interlobaris. 
The branches of the bronchial artery (solid black lines) can be seen arching 
over the margins of the lung and coming up from the depth of the lung. 
Many of the vessels have been omitted; only those easily seen with the 
unaided eye are shown. Two-thirds natural size. 
Not only is the pleura in the sheep supplied by branches of the bronchial 
artery, which pass directly to it, but it is also supplied indirectly by 
branches of the bronchial artery which pass into the substance of the 
lung at the hilus and, after giving off branches to the bronchi and to the 
connective-tissue septa, send radicles to the pleura. These radicles anas- 
