Hydrobiologia

, Volume 530, Issue 1–3, pp 81–89 | Cite as

Impulse conduction in the jellyfish Aglantha digitale

Article

Abstract

In the jellyfish Aglantha digitale two forms of swimming arise from two separate propagating axonal impulses: a fast, overshooting action potential that depends on TTX-resistant Na+ channels, and a low-amplitude spike that depends on T-type Ca2+ channels. While the Na+ action potential is propagated simply and without distortion, the shape of the Ca2+ spike depends on the past history of the axon; it is processed as well as propagated. Patch- and voltage-clamp experiments show how three classes of K+ channels contribute to this apparently unique system. A dual Na+/Ca2+ impulse mechanism may increase the bandwidth of an axonal line of communication but it also places restrictions on the form of the synaptic input needed for spike initiation.

Keywords

T-type Ca2+ channel TTX-insensitive Na+ channel voltage-clamp macropatch K+ channel clusters jellyfish swimming 

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Copyright information

© Kluwer Academic Publishers 2004

Authors and Affiliations

  1. 1.Department of PhysiologyUniversity WalkBristolUK

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