MAUTHNER’S CELL 125 
10 
Fig. 7 The left Mauthner’s cell drawn from two consecutive 10 uw sections. 
Both Mauthner’s cells in this brain were apparently regenerating their Nissl 
substance; the peripheral Nissl bodies are small and faintly stained, a zone of 
large deeply stained flakes completely surrounds the nucleus and a layer of chro- 
matin lines the nuclear membrane. The extent of the axone cap is indicated 
by the broken line on the medial side of the cell. 
Fig. 8 One of the Miiller cells of the right pars superior of the nucleus mo- 
torius tegmenti. This cell is indicated by the guide line Mil. C. in figure 2. The 
lateral dendrite was large and well developed. 
Fig. 9 Three cells from the pars superior; one was taken from the left side 
the other two from the right, as is indicated by the arrows. The clear area be- 
tween the solid line and the protoplasm of the cells is a’shrinkage space. The 
nuclei are relatively large as compared with the Mauthner’s and Miiller’s cells. 
Fig. 10 Part of the left Mauthner’s cell from the brain of a 50 mm. Ameiurus 
larva prepared by the Cajalmethod. A combination of five sections, 8 » thick, 
drawn with a Zeiss 2.0 mm. apo., oc. 6, and reduced to 600 diameters magnification. 
The series was cut in the plane of the lateral dendrite to show the terminations 
of the VIIIth root fibers upon it. These endings and the axone cap are the only 
parts of the pericellular net shown and the details of both types are drawn from 
single sections. The appearance of the two synapses in the silver preparation 
should be compared with that shown in figures 11, 12, and 13, which are taken 
from osmic-Zenker material. 
