Journal of comparative physiology

, Volume 152, Issue 2, pp 283–288 | Cite as

A factor in the haemolymph of the stick insect that depresses the activity of extraganglionic neurosecretory cells

  • L. H. Finlayson
  • I. Orchard
  • N. Day


Action potentials from extraganglionic neurosecretory neurons of the stick insectCarausius morosus have been recorded from low-activity preparations taken from animals in the light phase and from high-activity preparations taken from animals in the dark phase of a diel cycle. Wood'sCarausius saline, which has a K+ concentration of 18 mmol/1, was found to cause an increase in discharge frequency in all cells. Saline with a concentration of 12 mmol/1 K+ depressed activity. A ‘neutral’ concentration lies between 12 and 15 mmol/1. Light phase haemolymph contains an inhibitory factor which is independent of K+ concentration of the medium. Spectrophotometric studies show that the K+ level does not differ significantly at the times in the photophase that coincide with maximum and minimum electrical activity of the cells. Light phase haemolymph can be diluted to at least 20% with 18 mmol/1 K+ saline and still produce depression of activity in dark phase cells.


Depression Electrical Activity Inhibitory Factor Phase Cell Dark Phase 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. Aréchiga H, Cabrera-Peralta C, Huberman A (1979a) Functional characterization of the neurodepressing hormone in the crayfish. J Neurobiol 10:409–422Google Scholar
  2. Aréchiga H, Williams JA, Pullin RSV, Naylor E (1979b) Crosssensitivity to neuro-depressing hormone and its effect on locomotor rhythmicity in two different groups of crustaceans. Gen Comp Endocrinol 37:350–357Google Scholar
  3. Bernays EA (1980) The post-prandial rest inLocusta migratoria nymphs and its hormonal regulation. J Insect Physiol 26:119–123Google Scholar
  4. Finlayson LH (1980) Distribution and function of neurosecretory cells. In: Insect neurobiology and pesticide action (Neurotox 1979). Society of Chemical Industry, London, pp 297–303Google Scholar
  5. Finlayson LH, Orchard I (1978) Neurosecretory and electrical activity of extraganglionic neurons in the stick insect In: Gaillard PJ, Boer HH (eds) Comparative endocrinology. Elsevier/North Holland Biomedical Press, Amsterdam, pp 323–326Google Scholar
  6. Finlayson LH, Osborne MP (1968) Peripheral neurosecretory cells in the stick insect (Carausius morosus) and the blowfly larva (Phormia terrae-novae). J Insect Physiol 14:1793–1801Google Scholar
  7. Green GW (1964) The control of spontaneous locomotor activity inPhormia regina Meigen. II. Experiments to determine the mechanism involved. J Insect Physiol 10:727–752Google Scholar
  8. Handler AM, Konopka RJ (1979) Transplantation of a circadian pacemaker inDrosophila. Nature 279:236–238Google Scholar
  9. Hoyle G (1954) Changes in the blood potassium of the African migratory locust (Locusta migratoria migratorioides R. and F.) during food deprivation and the effect of neuromuscular activity. J Exp Biol 31:260–270Google Scholar
  10. Lettau J, Foster WA, Harker JE, Treherne JE (1977) Diel changes in potassium activity in the haemolymph of the cockroachLeucophaea maderae. J Exp Biol 71:171–186Google Scholar
  11. Orchard I (1976) Calcium dependent action potentials in a peripheral neurosecretory cell of the stick insect. J Comp Physiol 112:95–102Google Scholar
  12. Orchard I, Finlayson LH (1977) Electrical properties of identified neurosecretory cells in the stick insect. Comp Biochem Physiol [A] 58:87–91Google Scholar
  13. Riddiford LM (1974) The role of hormones in the reproductivec behaviour of female wild silkmoths. In: Barton-Browne L (ed) Experimental analysis of insect behavior. Springer, Berlin Heidelberg New York, pp 278–285Google Scholar
  14. Truman JW (1978) Rhythmic control over endocrine activity in insects. In: Gaillard PJ, Boer HH (eds) Comparative endocrinology. Elsevier/North Holland Biomedical Press, Amsterdam, pp 123–136Google Scholar
  15. Wood DW (1957) The effects of ions upon neuromuscular transmission in a herbivorous insect. J Physiol (Lond) 128:119–139Google Scholar

Copyright information

© Springer-Verlag 1983

Authors and Affiliations

  • L. H. Finlayson
    • 1
  • I. Orchard
    • 1
  • N. Day
    • 1
  1. 1.Department of Zoology and Comparative PhysiologyUniversity of BirminghamBirminghamEngland

Personalised recommendations