B3 MOTONEURON

B3 is a large neuron located on the dorsal surface of each buccal ganglia. It has projections down both ipsi- and contralateral dorsal buccal nerves and lateral buccal nerves. The two B3 neurons are electrically coupled. The role of B3 is unknown, however during feeding cycles, B3 is active in the rasp and swallow phases. It is inhibited by protraction phase interneuron N1M and excited by rasp phase CPG interneurons, N2v and swallow phase interneurons N3t and N3p. B3 is often used as a readout of N3t activity due to the presence of 1:1 excitatory postsynaptic potentials arising from N3t onto B3. Its activity during feeding rhythms is heavily modulated by activity in the octopaminergic swallow phase interneurons, OC.

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