Abstract
IN the crab Carcinus, mechanical stimulation of an anterior area of the carapace supplied by the tegumentary nerve results in a rapid withdrawal of the eyecup on that side1. Sensory pathways in any of the other ipsilateral brain nerves can also elicit the downward and slightly backward reflex movement of the eyecup. The motor axons mediating the response are known to be in the optic tract2, but their peripheral connexions are unknown. The action of the eyecup muscles in the reflex has been studied here in the wider context of a survey of several eyecup movements3.
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References
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Burrows, M., and Horridge, G. A., (in preparation).
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Sandeman, D. C., J. Exp. Biol. (in the press).
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BURROWS, M. Reflex Withdrawal of the Eyecup in the Crab Carcinus. Nature 215, 56–57 (1967). https://doi.org/10.1038/215056a0
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DOI: https://doi.org/10.1038/215056a0
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