Summary
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1.
Neuronal mechanism of the directional sensitivity in the crayfish statocyst interneurons was investigated by partial ablation of the crescent-like arrangement of statocyst receptors on the statocyst floor.
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2.
Interneuron C1 which responded to head-up tilting in the pitch plane received input from the contralateral statocyst. Ablation of those receptors located in the most anterior region of the sensory crescent significantly decreased the C1 response.
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3.
Interneuron C2 which responded to head-up and -down tilting in the pitch plane received input from the contralateral statocyst. Ablation of those receptors located in the anterior half of the crescent completely abolished the C2 response to head-up tilting but the response to head-down tilting was affected insignificantly. Subsequent ablation of the remaining receptors obliterated the response to head-down tilting.
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4.
Since anterior, lateral and posterior receptors are excited only by head-up, statocyst-side-up and head-down tilting respectively, we conclude that the directional sensitivity of the statocyst interneuron is based on its selective connection with a particular group of receptors which are located in a specific region of the sensory crescent.
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5.
Functional connections of other two statocyst interneurons (I1 and I2) with statocyst receptors are deduced from their response directionality and input statocyst.
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Takahata, M., Hisada, M. Statocyst interneurons in the crayfishProcambarus clarkii girard. J. Comp. Physiol. 149, 301–306 (1982). https://doi.org/10.1007/BF00619144
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DOI: https://doi.org/10.1007/BF00619144