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Fig. 8. Four examples of Fast resistance whole neuropil (FR/W) depressor motor
neurons (Dep MN) that have neuritic processes extending throughout most of the
neuropil when viewed from above. According to our classification scheme, these
four neurons (A–D) belong in the same group as the neuron represented in
Fig. 6. These neurons have
relatively large extracellular spikes (insets), and show a resistance response
(R). They receive monosynaptic excitatory (E) input, polysynaptic (P)
excitatory input and polysynaptic inhibitory (I) input. Also, similar to the
neuron shown in Fig. 6, these
neurons presumably receive monosynaptic input on the lateral-most branches in
the posterior-lateral quadrant. Note that the neurons in C and D lack
medial-most branches. Although it is possible that neurons in C and D may
represent another class of neurons, due to the great anatomical and
physiological similarity of these neurons with those in A and B and in
Fig. 6A, we consider them also
to belong to the class FR/W.
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