NERVE TERMINATIONS IN LUNG OF RABBIT 129 
A few nerve fibers were observed in the tunica media of the 
pulmonary veins. Berkley (93) made a similar observation. 
They appear to have the same relation to the musculature of the 
veins as the fibers above described have to the arteries. 
Fig. 15 Arteriole from pulmonary artery, showing a single nerve fiber in the 
adventitia which gives off short branches which terminate in relation to the indi- 
vidual smooth muscle cells of the tunica media. Rabbit R1, series C3. Methyl- 
ene blue, with aurantia counterstain. 254. Camera lucida. X 880. 
