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Fig. 8. Cross section (15 µm) through the right Mauthner cell of
Erpetoichthys calabaricus. The soma (S) of the Mauthner cell is
centered in this photomicrograph. The lateral dendrite extends towards the
right, where it bifurcates (arrows designate two branches) near the entry of
the VIIIth cranial nerve. The axon (A) projects to the left toward the
midline. Fibers that run parallel to the Mauthner axon project toward the soma
and form a network of fibers around the initial segment of the axon to form
the axon cap (delineated with a circle). Dorsal is up, and the open space
above the Mauthner axon is the IVth ventricle. Scale bar, 40 µm.