P3 is a motor neuron in the Aplysia californica pedal ganglia.
- No known alias
- Neurotransmitter is as yet unidentified
P3 is a 80-120um cell, and is lightly pigmented. It is located on the medioanterior pedal ganglion, adjacent to the cerebropedal connective in sector II, usually adjacent to P2. Like P2, P3 is considered to be a transverse contractor motor neuron, with innervation to the mesosegments of the Aplysia californica foot (Hening et al. 1979)
When stimulated in intact animals, P3 causes a large contraction dorsoventrally in the second, third, and fourth teguments. P3 is considered to be one of the mesosegmental motor neurons.While the animal is moving, P3 receives both depolarizing and hyperpolarizing stimuli, similar to that observed in P2. It is known to send axons to pedal ganglion nerve Pd9 (Hening et al. 1979).
1. Hening, W.A., Walters, E.T., Carew, T.J., Kandel, E.R. (1979) Motorneuronal control of locomotion in Aplysia. Brain Research, 179. 231-253.