Impulse pattern generation in a crayfish abdominal postural motoneuron

Kirk, Mark D.; Glantz, Raymon M.

doi:10.1007/bf01342665

Cited by 8 publications

(1 citation statement)

References 68 publications

(89 reference statements)

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“…In grasshopper nerves, we found pulse doublets displaying this minimum distance experimentally (Villagran et al, 2011). The appearance of short pulse trains like doublets has been reported by others, for instance Kirk and Glantz (1981) studying the impulse pattern generated in a crayfish abdominal postural motor neuron, obtained constant bursting in doublets in the largest tonic flexor motor neuron f6 induced by extrinsically injected current. The IPI histogram follows a Gaussian distribution and the mean was about 11 ms compared to a pulse width of 2.5 ms. Doublets with IPI greater than 37 ms did not appear.…”

Section: Introductionsupporting

confidence: 68%

Variations in interpulse interval of double action potentials during propagation in single neurons

Villagran-Vargas

Rodrı́guez-Sosa

Hustert

et al. 2012

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In this work, we analyzed the interpulse interval (IPI) of doublets and triplets in single neurons of three biological models. Pulse trains with two or three spikes originate from the process of sensory mechanotransduction in neurons of the locust femoral nerve, as well as through spontaneous activity both in the abdominal motor neurons and the caudal photoreceptor of the crayfish. We show that the IPI for successive low-frequency single action potentials, as recorded with two electrodes at two different points along a nerve axon, remains constant. On the other hand, IPI in doublets either remains constant, increases or decreases by up to about 3 ms as the pair propagates. When IPI increases, the succeeding pulse travels at a slower speed than the preceding one. When IPI is reduced, the succeeding pulse travels faster than the preceding one and may exceed the normal value for the specific neuron. In both cases, IPI increase and reduction, the speed of the preceding pulse differs slightly from the normal value, therefore the two pulses travel at different speeds in the same nerve axon. On the basis of our results, we may state that the effect of attraction or repulsion in doublets suggests a tendency of the spikes to reach a stable configuration. We strongly suggest that the change in IPI during spike propagation of doublets opens up a whole new realm of possibilities for neural coding and may have major implications for understanding information processing in nervous systems.

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Section: Introductionsupporting

confidence: 68%

Variations in interpulse interval of double action potentials during propagation in single neurons

Villagran-Vargas

Rodrı́guez-Sosa

Hustert

et al. 2012

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Central organization of crustacean abdominal posture motoneurons: Connectivity and command fiber inputs

Miall

Larimer

1982

J. Exp. Zool.

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Intracellular recordings and Lucifer dye injections were used to locate five of the six tonic abdominal flexor motoneurons, as well as several of the extensor motoneurons in the fourth abdominal ganglion of the crayfish, Procambarus clarkii. Each motoneuron was identified by its morphology and root records, and each was characterized by its inputs from identified flexion- and extension-evoking interneurons (command fibers). Finally its connections to other motoneurons were examined by current injection experiments. As indicated by others, the somata of most of the tonic flexor motoneurons are electrically silent; recordings were, therefore, made from neuropilar branches, but at unknown locations. The majority of motoneurons were found to be polysynaptically connected to the command neurons, although several apparent monosynaptic excitatory and inhibitory connections were also seen. Coupling between motoneurons was confirmed, but the major functional input to the motoneurons was from premotor interneurons. Coupling between motoneurons and interneurons is also indicated by the data, and may be responsible for the inhibition of some motoneurons seen during depolarizing current injections into other motoneurons. Again, such coupling is shown to be a minor influence in the overall organization of the behavior. The data suggest that flexion and extension behavior is predominantly organized via interneurons including the command fibers rather than by connections among the motoneurons themselves.

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Retinal illumination produces synaptic inhibition of a neurosecretory organ in the crayfish, pacifastacus leniusculus (Dana)

1983

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We have identified a cluster of neurosecretory cells in the crayfish eyestalk that possess dendrites in the second optic neuropil (Medulla) and project axons to the first optic neuropil (Lamina). Illumination of the ipsilateral retina produces a synaptic inhibition of these cells that is mimicked by iontophoresis of gamma-aminobutyric acid within the medullary neuropil. The neurosecretory nature of the cells, the efferent projection of their axons, and the strong inhibition of their spiking activity upon retinal illumination suggest that they may be involved in the feedback control of dark adaptation and/or circadian changes in visual sensitivity.

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Impulse pattern generation in a crayfish abdominal postural motoneuron

Cited by 8 publications

References 68 publications

Variations in interpulse interval of double action potentials during propagation in single neurons

Variations in interpulse interval of double action potentials during propagation in single neurons

Central organization of crustacean abdominal posture motoneurons: Connectivity and command fiber inputs

Retinal illumination produces synaptic inhibition of a neurosecretory organ in the crayfish, pacifastacus leniusculus (Dana)

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