Journal of comparative physiology

, Volume 96, Issue 1, pp 37–52 | Cite as

Ventilatory muscle activity in restrained and free-swimming dragonfly larvae (Odonata: Anisoptera)

  • R. S. Pickard
  • P. J. Mill
Article

Summary

The roles of certain abdominal muscles in ventilatory behaviour are discussed and illustrated with records of muscular activity obtained mainly from free-swimming animals. The following muscles are shown to be active during normal ventilation (Vn): respiratory and anterior dorso-ventrals (RDV and ADV), longitudinal tergal (LT), diaphragm, sub-intestinal and adductors of the anal appendages (VADP). The posterior dorso-ventral, lateral primary longitudinal sterno-pleural, and dorso-ventral oblique muscles were found to be inactive duringVn. TheRDV, ADV, LT andVADP are also active during ventilatory movements other thanVn.RDV activity is shown to be more variable in the free-swimming animal than recordings from dissected and restrained preparations previously suggested. Activity in theADV duringVn shows a reciprocal relationship with that in theRDV. Postulated control elements in larval ventilation are found to parallel many described in other ventilatory systems and motor rhythms generally.

Keywords

Muscle Activity Reciprocal Relationship Abdominal Muscle Muscular Activity Control Element 

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Copyright information

© Springer-Verlag 1975

Authors and Affiliations

  • R. S. Pickard
    • 1
    • 2
  • P. J. Mill
    • 1
    • 2
  1. 1.Department of Pure and Applied ZoologyUniversity of LeedsLeedsEngland
  2. 2.Department of ZoologyUniversity College Cardiff (F1 1XL)WalesEngland

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