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Cited by 46Marine Invertebrate Physiology and EcologyNeuroscience and Neuropharmacology ResearchIon channel regulation and function

Central Circuitry in the Jellyfish Aglantha Digitale: I. The Relay System

Mackie, G. O., Meech, R. W.·1995·Journal of Experimental Biology
DOI 10.1242/jeb.198.11.2261
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Abstract

1. The relay system is an interneuronal pathway in the margin of the jellyfish Aglantha digitale. It excites a second interneuronal pathway, the carrier system, and is itself excited by pacemaker neurones concerned with slow swimming. It also excites a slow conduction pathway in the tentacles causing graded, tonic contractions of all the tentacles during slow swimming. 2. The pacemakers, the carrier system and the relay system all contribute to the production of excitatory postsynaptic potentials (EPSPs) in a giant axon that runs in the outer nerve ring (ring giant axon). These EPSPs may cause the latter to spike during slow swimming. If it does so, it will fire tentacle giant axons, producing twitch contractions of the tentacles. Such contractions probably help to contract the tentacles rapidly at the start of slow swimming. This is an unusual case of a giant axon that normally mediates escape behaviour being appropriated for use during a non-escape activity. 3. The relay system can conduct impulses on its own but their conduction velocity is greatly increased when preceded by either pacemaker or ring giant spikes. This phenomenon, termed the 'piggyback effect', may be due to extracellular field effects rather than to actions mediated by chemical or electrical synapses. 4. Recordings from the epithelial cells that ensheath the ring giant and outer nerve ring neurones show miniature synaptic potentials and other events that seem to reflect events in the nervous system, but no functions can be assigned to them. 5. There is no obvious counterpart to the relay system in medusae lacking escape circuitry.

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Crossref · 10.1242/jeb.198.11.2261

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  • The circuits mediating locomotion, feeding, and tentacle contractions in Aglantha are composed of at least 14 distinct neuron types with dedicated functions, including a relay, a carrier, and a pacemaker system.

    “The circuits mediating locomotion, feeding, and tentacle contractions in Aglantha are composed of at least 14 distinct neuron types with dedicated functions, including a relay, a carrier, and a pacemaker system [42,45,73,74].”

    From Back to the Basics: Cnidarians Start to Fire (2017) · cites this paper as [42]

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Authors
Mackie, G. O., & Meech, R. W.
Affiliations
  • University of Victoria (CA)
  • University Walk 2 Department of Physiology , , Bristol, UK
ORCID
Meech, R. W.
Venue
Journal of Experimental Biology
Publisher
The Company of Biologists
Published
1995-11-01
Volume
198
Issue
11
Pages
2261-2270
ISSN
  • 0022-0949 (ISSN-L)
  • 1477-9145
DOI
10.1242/jeb.198.11.2261
OpenAlex
W2343585655
Cited by
46
References
31
Citations by year
2026: 3 · 2025: 2 · 2024: 1 · 2023: 2 · 2021: 1 · 2020: 1 · 2019: 1 · 2018: 3 · 2017: 2 · 2016: 3 · 2015: 2 · 2012: 1
FWCI
1.14
Type
journal article
Language
en
Open access
closed
Licence
www.biologists.com/user-licence-1-1/ (vor)
Locations
  • Journal of Experimental Biology (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Physical Sciences › Earth and Planetary Sciences › Paleontology › Marine Invertebrate Physiology and Ecology
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Ion channel regulation and function
Keywords
Aglantha digitale, relay systems, carrier systems, giant axons, excitatory postsynaptic potentials, epithelial cells, escape behavior, jellyfish

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