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Fig. 1. Axon distributions of sint1 and sint2. (Top) A diagram of
the dorsal aspect of the Melibe (rostral at the top), illustrating
the three major subdivisions of the CNS: the cerebral ganglia (C), pleural
ganglia (Pl) and pedal ganglia (Pd). The cell bodies and major projections of
sint1 and sint2 are shown diagrammatically, based on
interpretation of 24 successful Lucifer Yellow dye fills. Examples of Lucifer
Yellow stained interneurons are shown below. Sint1 branches near its
cell body located just caudal to the tentacular lobe (T) in the pleural
ganglion and sends a process to the ipsilateral pedal ganglion that arborizes
in the pedal ganglion neuropil. It does not project across the midline
via the central commissure or beyond the CNS. Sint2 branches
in the pedal ganglion and sends a process via the pedal-pedal
connective to the opposite pedal ganglion. No processes were seen to project
to the pleural ganglia or leave the CNS. The dye fills illustrated in this
figure were done in isolated ganglion preparations.
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