120 O. LARSELL 
pointed out to me by Doctor Miller. These various muscle 
bands have a very rich innervation. The fibers which pass to 
them are easily distinguished from those which have been 
described. above as sensory fibers, by reason of the smaller size 
of the former and the fact that they are unmyelinated. 
Many of these fibers are direct processes from the ganglionic 
cells, as shown in figures 8 and 9, and are therefore postgan- 
Fig. 8 Cluster of ganglionic cells in the wall of one of the larger intrapul- 
monary bronchi, showing preganglionic fibers terminating about the nerve cells 
in pericellular, intracapsular networks, and postganglionic fibers as processes 
from the nerve cells. A portion of a nerve trunk is also shown. Rabbit R3. 
Methylene-blue stain. 50u. Camera lucida, stage level. X 400. 
glionic fibers. Some, as in figure 9, can be observed to pass 
directly from such a ganglion cell to the smooth muscle bands, 
where they branch into numerous slender varicosed rami. These 
rami run parallel to the smooth muscle bands between the smaller 
bundles of muscle cells which compose the bands. At intervals 
they give off short twigs which terminate as small knobs on the 
muscle cells. The processes from other ganglionic cells, especially 
