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Journal of Experimental Biology 61,639-654 (1974)
Published by Company of Biologists 1974

Neuronal Homologies and the Control Of Branchial Tuft Movements in Two Species of Tritonia

D. A. DORSETT ¹

¹ Marine Science Laboratories, Menai Bridge, Anglesey

Comparative morphological and physiological studies of the branchial tuft retractor system of Tritonia hombergi and T. diomedia show a number of similarities and differences. In both species two homologous neurones in each pedal ganglion produce complete and partial contractions of the ipsilateral pinnae respectively.

Three pleural neurones cause bilateral contractions in T. hombergi: L Pl6 and R Pl5 inducing complete, and R Pl6 partial, withdrawal of the tips. This differs from T. diomedia, where principal control is vested in the pleural giant cells.

The latency of tuft withdrawal declines and the rate of contraction increases with increasing impulse frequency in the retractor neurones, the musculature apparently responding to the second impulse of a series. After due allowance for conduction delays, only a small interval remains unaccounted for. Until electrical activity can be recorded from the musculature, the suggestion of the relay of central excitation through the peripheral plexus must be regarded as uncertain.

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