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- W2086797319 abstract "Abstract Nerve‐impulse conduction is greatly speeded by myelin sheaths in vertebrates, oligochaete annelids, penaeid and caridean shrimp, and calanoid copepods. In the first three invertebrate cases, myelin arises from glial cells, as it does in vertebrates. The contribution of the glial cells to the layered structure of the myelin is clear: their nuclei are either embedded in the layers or reside in contiguous cytoplasmic compartments, and their cell membranes are seen to be continuous with those of the myelin layers. However, with calanoids, the association with glial cells presumed necessary to generate the myelin has never been satisfactorily identified. We have conducted a systematic examination of thin sections through different parts of the copepod nervous system to identify the structural organization of copepod myelin and the likely mechanism for its formation. We find that myelination appears to commence by laying down and compacting a cisternal tongue against the inside of the axolemma. This is followed by the successive layering and compaction of additional tongues to create a stack of tongues. The margins of the tongues then expand to encircle the interior of a neurite, meeting and fusing to form complete concentric myelin. No sign of glial involvement could be detected at any stage. Unlike glially derived myelin, the extracellular tracer lanthanum did not penetrate between the myelin layers in copepods, further evidence against a glial source. We believe this to be the first demonstration of a nonglial origin for myelin in any species. J. Comp. Neurol. 519:3281–3305, 2011. © 2011 Wiley‐Liss, Inc." @default.
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- W2086797319 date "2011-09-14" @default.
- W2086797319 modified "2023-10-16" @default.
- W2086797319 title "Novel organization and development of copepod myelin. ii. nonglial origin" @default.
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- W2086797319 doi "https://doi.org/10.1002/cne.22699" @default.
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