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Figure 10


Fig. 10. Three depressor motor neurons (Dep MN) that belong to the Medium (M) class. These neurons have relatively small extracellular spikes, thin neuritic branches and unique branching patterns. Each M neuron that we recorded from was unique in morphology from all other M neurons. (A) This neuron has a relatively sparse neuritic arbor. It shows a resistance and an assistance response to movement (RA), and receives monosynaptic excitatory input (E) and polysynaptic inhibition (I). (B) This neuron has very fine neuritic branches that cover most of the neuropil when viewed from above. It does not respond to movement of the CBCO strand (N) and only receives polysynaptic EPSPs (P). (C) This neuron has neuritic branches that cover most of the neuropil except for the anterior-most parts of the anterior-lateral and anterior-medial quadrants. This neuron shows no response to movement and receives only IPSPs.





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