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Journal of Experimental Biology 59,17-38 (1973)
Published by Company of Biologists 1973

Statocyst-Induced Eye Movements in the Crab Scylla Serrata : III. The Anatomical Projections of Sensory and Motor Neurones and the Responses of the Motor Neurones

D. C. SANDEMAN ¹ and A. OKAJIMA ²

¹ Department of Neurobiology, Research School of Biological Sciences, Australian National University, Canberra, A.C.T., Australia
² Department of Neurobiology, Research School of Biological Sciences, Australian National University, Canberra, A.C.T., Australia; Biological Institute, Yokohama City University, Yokohama, Japan

1. The sensory axons of the thread hair receptors, free hook hair receptors and most receptors of the statolith area of the crab statocyst all project to the same dorsolateral part of the brain. Large sensory receptors which innervate some hairs surrounding the statolith project to a more ventral site, and send some branches across to the contralateral side of the brain.

2. The central projections of oculomotor neurones have a characteristically open branch pattern and their dendritic field corresponds closely with that of the thread hairs. There are no branches extending to the contralateral side of the brain.

3. Intracellular responses from the motor neurones of horizontal eye-movement muscles during nystagmus show that they are probably directly inhibited during a fast-phase movement of the eye opposite to the direction in which they act. During a slow-phase eye movement opposite to their preferred direction the input to the motor neurones is diminished pre-synaptically.

4. Sets of antagonist motor neurones maintain a fairly rigid relationship to one another so that an increase in activity of one set leads to a decrease in the antagonists. Neither this, nor the onset of the fast phase of nystagmus, is governed by proprioceptive input or by the frequency of discharge of the motor neurones themselves.

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