Abstract
As the nervous system evolved from the diffused to centralised form, the neurones were joined by the appearance of the supportive cells, the neuroglia. Arguably, these non-neuronal cells evolve into a more diversified cell family than the neurones are. The first ancestral neuroglia appeared in flatworms being mesenchymal in origin. In the nematode C. elegans proto-astrocytes/supportive glia of ectodermal origin emerged, albeit the ensheathment of axons by glial cells occurred later in prawns. The multilayered myelin occurred by convergent evolution of oligodendrocytes and Schwann cells in vertebrates above the jawless fishes. Nutritive partitioning of the brain from the rest of the body appeared in insects when the hemolymph-brain barrier, a predecessor of the blood-brain barrier was formed. The defensive cellular mechanism required specialisation of bona fide immune cells, microglia, a process that occurred in the nervous system of leeches, bivalves, snails, insects and above. In ascending phylogeny, new type of glial cells, such as scaffolding radial glia, appeared and as the bran sizes enlarged, the glia to neurone ratio increased. Humans possess some unique glial cells not seen in other animals.
Is evolution a theory, a system or a hypothesis? It is much more - it is a general postulate to which all theories, all hypotheses, all systems must henceforward bow and which they must satisfy in order to be thinkable and true. Evolution is a light which illuminates all facts, a trajectory which all lines of thought must follow-this is what evolution is.
Pierre Teilhard de Chardin.
quoted from Theodosius Dobzhansky, Nothing in Biology Makes Sense Except in the Light of Evolution, The American Biology Teacher, Vol. 35, No. 3 (Mar., 1973), pp. 125–129.
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VP’s work is supported by a grant from the National Institute of General Medical Sciences of the National Institutes of Health (R01GM123971). VP is an Honorary Professor at University of Rijeka, Croatia.
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Verkhratsky, A., Ho, M.S., Parpura, V. (2019). Evolution of Neuroglia. In: Verkhratsky, A., Ho, M., Zorec, R., Parpura, V. (eds) Neuroglia in Neurodegenerative Diseases. Advances in Experimental Medicine and Biology, vol 1175. Springer, Singapore. https://doi.org/10.1007/978-981-13-9913-8_2
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Print ISBN: 978-981-13-9912-1
Online ISBN: 978-981-13-9913-8
eBook Packages: Biomedical and Life SciencesBiomedical and Life Sciences (R0)