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Fig. 2. Myelinated axons at the level of the recording site, 5 µm transverse
section 500 µm posterior to the caudal edge of the facial lobe. The mlf is
on either side of the midline. The dorsal portion, mlfd, contains
the large M-axon (asterisk) and is separated from the ventral portion,
mlfv, by a commissure (arrow). The surface of the hindbrain and the
4th ventricle are dorsal to the M-axons.