Left Pedal1

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LP1 is a neuron in the pedal ganglion of Hermissenda.

Drawing of Hermissenda nervous system from T. P. Jerussi and D. L. Alkon. Ocular and extraocular responses of identifiable neurons in pedal ganglia of Hermissenda crassicornis. J.Neurophysiol. 46 (3):659-671, 1981.

Anatomical properties

  • Soma size 150-200 microns
  • Located immediately lateral to statocyst.
  • It does not have a counterpart in the right pedal ganglion.
  • Sometimes is is displaced with LP2, but easily recognizable because it is more heavily pigmented orange.
  • LP1 axon has extensive arborizations in the ipsilateral pedal ganglion before fibers exit through nerves 1, 3,4, and cross the midline.

Electrophysiological properties

  • Resting membrane potential = -60 mV
  • Action potential amplitude 55-85 mV.
  • Spontaneous impulse activity about 0.4-0.5 Hz at regular intervals

Function

  • Stimulation caused brisk movement of cerata
  • Movement abolished by severing nerves 1 and 4
  • Somewhat responsive to light flashes - even when eyes removed

References:

  • T. P. Jerussi and D. L. Alkon. Ocular and extraocular responses of identifiable neurons in pedal ganglia of Hermissenda crassicornis. J.Neurophysiol. 46 (3):659-671, 1981.