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 lowamplitude 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.
Key words: T-type Ca2+ channel, TTX-insensitive Na+ channel, voltage-clamp, macropatch, K+ channel clusters, jellyfish swimming
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Preview
Unable to display preview. Download preview PDF.
Author information
Authors and Affiliations
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2004 Kluwer Academic Publishers
About this paper
Cite this paper
Meech, R.W. (2004). Impulse conduction in the jellyfish Aglantha digitale. In: Fautin, D.G., Westfall, J.A., Cartwrigh, P., Daly, M., Wyttenbach, C.R. (eds) Coelenterate Biology 2003. Developments in Hydrobiology, vol 178. Springer, Dordrecht. https://doi.org/10.1007/978-1-4020-2762-8_10
Download citation
DOI: https://doi.org/10.1007/978-1-4020-2762-8_10
Publisher Name: Springer, Dordrecht
Print ISBN: 978-1-4020-2761-1
Online ISBN: 978-1-4020-2762-8
eBook Packages: Springer Book Archive