Metasegmental motor neurons
Anatomy and Location
Metasegmental cells were 70-120um in diameter with indistinct pigmentation. Most were found to be located in anterior sector II, although some were also seen scattered throughout sector II (Fig. 2).
Motor effects and electrophysiology
About half of the metasegmental neurons were reported to cause longitudinal contraction, while the other half caused transverse effects. Both showed varying input after tail stimulation (Fig. 3), although head stimulation causes all metasegmental neurons to become excited.
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.