Axotomy-induced Long-lasting Firing in an Identified Crayfish Motoneuron

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概要

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• An anal motoneuron L (AML) of Procambarus clarkii has its soma in the 6th abdominal ganglion (A6) and its axon extends along the posterior intestinal nerve (PIN) out from A6, but how far its ascending process runs forward through the nerve cord remains unknown. In this study, identified AML activity was recorded from PIN in the isolated nerve cord preparation which composed of thoracic (T1-T5) and abdominal ganglions (A1-A6) with PIN. Axotomy at any level below A1, or at a more distal position, induces repetitive firing in an otherwise silent AML. The firing showed a characteristic discharge pattern and persisted for more than an hour (≤ 67 min, N=108). The duration and the latency of firing became shorter while the frequency increased as the axotomy was performed more caudally. The response was not blocked by bathing the nerve cord in high Ca^<2+>/Mg^<2+> saline or Ca^<2+> -free saline, but was stopped by ligature of the nerve cord caudal to the axotomized site or by application of a hyperpolarizing pulse to this region. A depolarizing pulse instead enhanced firing. This indicates the axotomy-induced firing originates in AML itself and results from depolarization occurring at the cut end and also an ascending axonal process of AML runs through the nerve cord rostrally up to A1, but not beyond this ganglion.

• 社団法人日本動物学会の論文
• 1993-12-15

著者

• MURAMOTO Atsuko

  Fukushima Biomedical Institute of Environmental & Neoplastic Disease;

• Muramoto A

  Fukushima Biomedeical Inst. Of Environmental And Neoplastic Diseases Futaba‐gun Jpn

関連論文

• -288-BASIC STUDIES ON THE MEASUREMENT OF MICROMAGNETIC SIGNALS OF HUMAN SUBJECTS AND THE MAGNETOCARDIOGRAM : Arrythmia, His Bundle Electrogram, Electrophysiology : PROCEEDINGS OF THE 42nd ANNUAL MEETING OF THE JAPANESE CIRCULATION SOCIETY
• Axotomy-induced Long-lasting Firing in an Identified Crayfish Motoneuron
• Spontaneous Firing in the Isolated Anucleate Axonal Segment of an Identified Crayfish Motoneuron(Physiology)
• Ionic Dependence of the Axotomy-Induced Long-Lasting Firing in an Identified Crayfish Motoneuron

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