Naked axons and symmetrical synapses in coelenterates
Abstract
ABSTRACT Examination of sections of the marginal ganglion of the jellyfish Cyanea and the hydromedusan Phialidium by the electron microscope, in a region where nervous tissue is readily identified on account of its abundance, reveals the following features. Nerve-cell bodies and axons are crowded together without special glial cells. The axons form a layer between the cell-bodies and the mesogloea and the spaces between them are continuous with other intercellular spaces and with the mesogloea. Features typical of nerve-cells in other animals are mitochondria, Golgi region (= γ-cytomembranes), neurotubules (= canaliculi) about 16 mμ wide, and several types of vesicle ranging in size from 50 to 200 mμ, including synaptic vesicles of 50 to 100 mμ. Features not typical of nerve-cells are the modified (possibly sensory) cilia on the dendrites of bipolar cells and the absence of clumps of Nissl substance and neurofilaments. Synapses between axons (or with a perikaryon) have a synaptic cleft of 18 to 22 mμ and a crowded row of synaptic vesicles within the neurones on each side of the synapse.
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Bidirectional synapses in Cnidaria were first described at the ultrastructural level, with synaptic vesicles accumulated on both sides of the synapse.
“Bidirectional synapses in Cnidaria (Figure 2) were first described at the ultrastructural level, containing synaptic vesicles accumulated at both sides of the synapse [36].”
From Back to the Basics: Cnidarians Start to Fire (2017) · cites this paper as [36]
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Back to the Basics: Cnidarians Start to Fire
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- Authors
- Horridge, G. A., & Mackay, B.
- Affiliations
- University of Iowa (US)
- Venue
- Journal of Cell Science
- Publisher
- The Company of Biologists
- Published
- 1962-12-01
- Volume
- S3-103
- Issue
- 64
- Pages
- 531-541
- ISSN
- 0021-9533 (ISSN-L)
- 1477-9137
- OpenAlex
- W2133826841
- Cited by
- 97
- References
- 14
- Citations by year
- 2025: 1 · 2024: 2 · 2021: 3 · 2019: 3 · 2017: 2 · 2016: 1 · 2015: 1 · 2012: 1
- FWCI
- 5.72
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Journal of Cell Science (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 › Neuroscience › Cellular and Molecular Neuroscience › Neurobiology and Insect Physiology Research
- Keywords
- coelenterates, jellyfish, Cyanea, hydromedusae, neurons, synaptic vesicles, synaptic cleft, neurotubules, mesogloea, glial cells
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