Abstract
Treherne and Maddrell1,2 have described a continuous sheath of tracheal and fat-body cells around the nerve cord of the Phasmid Carausius. They have also obtained measurements showing that the fluid between these structures was some 20 mV positive with respect to the haemolymph, seemingly because of a chloride diffusion potential. Their investigation was related to the specialized ionic composition of the haemolymph in Carausius, but they concluded that the sheath was not obviously related to the functioning of the nervous system in this environment.
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References
Maddrell, S. H. P., and Treherne, J. E., Nature, 211, 215 (1966).
Treherne, J. E., and Maddrell, S. H. P., J. Exp. Biol., 46, 413 (1967).
Narahashi, T., Adv. Insect Physiol., 1, 175 (1963).
Boné, G. J., Ann. Soc. Zool. Belg., 75, 123 (1944).
Ramsay, J. A., J. Exp. Biol., 32, 183 (1955).
Philips, J. E., J. Exp. Biol., 41, 39 (1964).
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BOULTON, P., ROWELL, C. Structure and Function of the Extraneural Sheath in Insects. Nature 217, 379–380 (1968). https://doi.org/10.1038/217379a0
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DOI: https://doi.org/10.1038/217379a0
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