NERVE TERMINATIONS IN LUNG OF RABBIT Tf 
consists in the fact that masses of lymphoid tissue are often 
located between the bifurcating branches in such a manner as to 
lie in close juxtaposition to the epithelium in which the nerve 
endings are found. In many cases the fibers leading to the 
nerve terminations pass through the borders of the lymphoid 
mass, and the latter frequently extends to the base of the 
epithelium. 
Fig. 3 Sensory nerve termination at the division point of a small bronchus. 
Rabbit R1, series D5. Methylene-blue stain. Camera lucida. 624. X 374. 
As the bronchial tree is followed to its smaller branches, it is 
easy in thick sections to trace individual fibers which are given 
off from the nerve bundles. These pass either individually or 
accompanied for greater or shorter distances by one or two 
similar fibers, and make their way to the points of division of 
the bronchioli and alveolar ducts. Such a fiber, with its termi- 
nation at the division of a small bronchus, is illustrated in figure 
3. It will be noted that the termination, which is located in a 
