124 O. LARSELL 
The nerve bundles follow the bronchi in diminishing size to 
the bronchioli and even to the alveolar ducts. They give off 
branches which are distributed to the smooth muscle bands 
around these smaller air passages, as shown in figure 12, which 
Fig. 12 Nerve terminations on the muscle bands of a bronchiolus. Rabbit 
Ri, series Al. Methylene blue, aurantia counterstain. 254. Camera lucida. 
x 300. 
