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Journal of Experimental Biology 48,279-289 (1968)
Published by Company of Biologists 1968

The Electrical Activity of the Radial Nerve in Diadema antillarum Philippi and Certain Other Echinoids

N. MILLOTT 1 and H. OKUMURA 2

1 Department of Zoology, Bedford College, University of London
2 Department of Zoology, Bedford College, University of London; Zoological Institute, Faculty of Science, Hokkaido University, Sapporo, Japan

1. The propagated massed potentials which follow stimulation of the radial nerve in Arbacia, Diadema, Echinus and Paracentrotus are described.

2. Approximate values for the averaged absolute and relative refractory periods and the conduction velocity were obtained.

3. The response of Diadema has a double peak which is shown to represent responses of nerves differing in excitability and conduction velocity. The fast potential is concerned with spine movement. The slow potential is related to inhibition of spine movements excited photically.

Submitted on September 22, 1967






© The Company of Biologists Ltd 1968