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Naked axons and symmetrical synapses in coelenterates

Date

1962-12-01

Authors

Horridge, George Adrian
Mackay, Bruce

Journal Title

Journal ISSN

Volume Title

Publisher

Company of Biologists Ltd

Abstract

Summary 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.

Description

Keywords

jellyfish, Cyanea, hydromedusan, Phialidium, axon, coelenterate, ganglion

Citation

Source

The Quarterly journal of microscopical science

Type

Journal article

Book Title

Entity type

Access Statement

Open access via publisher website

License Rights

DOI

10.1038/204499b0

Restricted until

2037-12-31