<Originals>Tegumentary nerve projections and the evoked neuronal activities in crayfish cerebral ganglion

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概要

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• The axonal morphology of the tegumentary nerves and related interneurons in the crayfish cerebral ganglion was studied with intracellular staining and with electrical recording techniques. The morphological characteristics of the tegumentary neurons within the cerebral ganglion were classified into three types based on the distribution of their axon types ; ascending, horizontal and descending ones. The neurons showed typical action potentials with appropriate overshoots. Interneuron activities, evoked by electrical stimulation of the tegumentary nerve, were seen in the descending, oculomotor and optic nerve motor bundle neurons. The terminal distribution showed overlapping between the tegumentary neuropile and the dendritic fields in the identified interneurons. The identified descending interneurons developed the action potential with 10mV overshoot in general. The projections of this interneuron type were found within the ipsilateral side of the tritocerebral ganglion. The response characteristics for the oculomotor nerve indicate that the membrane potential for these interneurons increased with the increase of the stimulus intensity. The axons ran through the tritocerebrum and terminated mainly in the mediolateral region of the lateral posterior protocerebrum. The dye-coupling between the oculomotor nerve and ascending interneurons was observed in the deutocerebrum. The response of the optic nerve motor bundle developed an excitatory depolarization by stimulation of the ipsilateral oesophageal connective. The dendritic neuropile of the optic nerve motor bundle located ipsilateral tegumentary neuropile and the soma was in the ipsilateral protocerebrum. The morphology was discussed in relation to the electrical activities.

• 近畿大学の論文

著者

• CHIBA Atsushi

  First Department of Physiology, Kinki University School of Medicine

• Chiba Atsushi

  First Department Of Physiology Kinki University School Of Medicine

• Chiba Atsushi

  Department Of Physiology Kinki University School Of Medicine

• Chiba A

  Kinki Univ. School Of Medicine Osaka Jpn

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