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Journal of Experimental Biology 56,129-137 (1972)
Published by Company of Biologists 1972

A Study of the Function of the Neural Fat-Body Sheath in the Stick Insect, Carausius Morosus

J. E. TREHERNE ¹

¹ A.R.C. Unit of Invertebrate Chemistry and Physiology, Department of Zoology, University of Cambridge

1. The effects of variation in the sodium concentration of the bathing media on axonal function has been measured in de-sheathed connectives in the presence of the overlying neural fat-body sheath.

2. The response to solutions of the same sodium concentration as the haemolymph (15 mM/1) was found to be essentially similar to that recorded in de-sheathed connectives in the absence of the fat-body sheath, there being a rapid decline in amplitude of the recorded action potentials in both preparations.

3. On the basis of these observations it is concluded that the neural fat-body sheath is unlikely to be involved in the regulation of the extra-neuronal sodium level.