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Modification of statocyst input to local interneurons by behavioral condition in the crayfish brain

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Abstract

Posture control by statocysts is affected by leg condition in decapod crustaceans. We investigated how, in the crayfish brain, the synaptic response of local interneurons to statocyst stimulation was affected by leg movements on and off a substratum. The magnetic field stimulation method permitted sustained stimulation of statocyst receptors by mimicking body rolling. The statocyst-driven local interneurons were classified into four morphological groups (Type-I–IV). All interneurons except Type-IV projected their dendritic branches to the parolfactory lobe of the deutocerebrum where statocyst afferents project directly. Type-I interneurons having somata in the ventral-paired lateral cluster responded invariably to statocyst stimulation regardless of the leg condition, whereas others having somata in the ventral-unpaired posterior cluster showed response enhancement or suppression, depending on the cell, during leg movements on a substratum, but no response change during free leg movements off the substratum. The synaptic responses of Type-II and IV interneurons were also affected differently by leg movements depending on the substratum condition, whereas those of Type-III remained unaffected. These findings suggest that the statocyst pathway in the crayfish brain is organized in parallel with local circuits that are affected by leg condition and those not affected.

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Abbreviations

NGI:

Nonspiking giant interneurons (Okada and Yamaguchi 1988)

SDI:

Statocyst descending interneurons (Hama and Takahata 2003)

EUMN, EDMN:

Eyecup up (down) motor neuron (Furudate et al. 1996)

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Acknowledgements

This work was partially supported by a grant (no. 14340260) from the Ministry of Education, Science, Culture and Sports, Japan.

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Correspondence to N. Hama.

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Hama, N., Takahata, M. Modification of statocyst input to local interneurons by behavioral condition in the crayfish brain. J Comp Physiol A 191, 747–759 (2005). https://doi.org/10.1007/s00359-005-0630-z

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  • DOI: https://doi.org/10.1007/s00359-005-0630-z

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