P2 is a motor neuron in the Aplysia californica pedal ganglia.
- No known alias
- Neurotransmitter is as yet unidentified
P2 is a 100-150um cell, and is light in pigment. It is located on the medioanterior pedal ganglion, adjacent to the cerebropedal connective in sector II, usually adjacent to P3 (Fig. 1). P2 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, P2 causes a large contraction dorsoventrally in the lateral tegument, and also a transverse contraction of the second and possibly the third and first segments of the foot, although there appears to be no longitudinal contraction effect. Therefore, P2 is considered to be one of the mesosegmental motor neurons. While the animal is moving, P2 receives both depolarizing and hyperpolarizing stimuli. It is known to send axons to pedal nerves 8 and/or 9 (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.