Ionic Currents of the Scyphozoa
Scyphozoans are members of the phylum Cnidaria and, according to Werner (1973), are the second most primitive extant class of this, the most primitive group of animals to possess a recognizable nervous system. Their nervous systems are, for the most part, composed almost entirely of diffuse two-dimensional plexuses of neurons, nerve nets (Passano, 1982), the most prominent of which is the motor nerve net (Anderson and Schwab, 1981), a diffuse plexus of large bipolar neurons that transmits motor activity from marginal pacemakers to the swimming muscle. This nerve net was previously called the Giant Fiber Nerve Net (Horridge, 1954), on account of the unusually large size of its component neurons.
KeywordsReversal Potential Outward Current Transient Current Voltage Step Voltage Clamp Recording
Unable to display preview. Download preview PDF.
- Aldrich, R. W., Getting, P. A., and Thompson, S. H., 1979a, Inactivation of delayed outward current in molluscan neurone somata, J. Physiol. (Lond.) 291:507–530.Google Scholar
- Aldrich, R. W., Getting, P. A., and Thompson, S. H., 1979b, Mechanism of frequency-dependent broadening of molluscan neurone soma spikes, J. Physiol. (Lond.) 291:531–544.Google Scholar
- Anderson, P. A. V., 1987, Properties and pharmacology of a TTX-insensitive Na+ current in neurones of the jellyfish Cyanea capillata, J. exp. Biol. 133:231–248.Google Scholar
- Anderson, P. A. V., and McKay, M. C., 1987, The electrophysiology of cnidocytes, J. exp. Biol. 133:215–230.Google Scholar
- Frankenhaeuser, B., and Hodgkin, A. L., 1957, The action of calcium ions on the electrical properties of squid axons, J. Physiol. (Lond.) 137:218–244.Google Scholar
- Hille, B., 1984, Ionic Channels of Excitable Membranes, Sinauer, Sunderland, Mass.Google Scholar
- Horridge, G. A., 1954, The nerves and muscles of medusae. I. Conduction in the nervous system of Aurellia aurita Lamarck, J. exp. Biol. 34:594–600.Google Scholar
- Passano, L. M., 1982, Scyphozoa and Cubozoa, in: Electrical Conduction and Behaviour in “Simple” Invertebrates, pp. 149–202 (G. A. B. Shelton, ed.), Clarendon Press, Oxford.Google Scholar
- Werner, B., 1973, New investigations on the systematics of the class Scyphozoa and the phylum Cnidaria, Publ. Seto Mar. Lab. 20:35–61.Google Scholar