Abstract
Bear, Schmitt and Young1 have concluded that, in addition to a collagenous connective tissue investment, the giant axon of the stellar nerve of the squid, Loligo pealii, is also surrounded by a thin sheath rich in lipid material. This sheath, although extremely thin, is in many respects comparable to the myelin sheath of a mammalian nerve fibre. Polarization optics and X-ray diffraction studies have suggested that there is an essential unity in the ultra-structure of the lipid-containing sheath that surrounds the axon of all nerve fibres, whether vertebrate or invertebrate, myelinated or unmyelinated2. Little is known of the chemical nature of the lipids of this sheath in squid nerve, or of those of the axoplasm.
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References
Bear, R. S., Schmitt, F. O., and Young, J. Z., Proc. Roy. Soc., B, 123, 496 (1937).
Schmitt, F. O., and Bear, R. S., Biol. Rev., 14, 27 (1939).
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Young, J. Z., Phil. Trans. Roy. Soc., B, 229, 465 (1939).
Lanfranchi, E., Arch. Sci. Biol. (Italy), 24, 120 (1938).
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McCOLL, J., ROSSITER, R. Lipids of Squid Nerve. Nature 166, 185–186 (1950). https://doi.org/10.1038/166185a0
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DOI: https://doi.org/10.1038/166185a0
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