Directional sensitivity of an identified wind-sensitive interneuron during the postembryonic development of the locust

Dirk Bucher, Hans Joachim Pflüger

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

Simultaneous extracellular recordings from both locust abdominal connectives show a differential activation of both bilateral homologues of an identified long projection interneuron (A4I1) in response to wind stimuli from different directions. Despite the previously shown extensive structural dynamics of sensory afferents and synaptic rearrangement of the direct afferent-to-interneuron connections during postembryonic development, a directional sensitivity is already present in first instar nymphs. Only quantitative changes in the strength of the directional response can be detected. Intracellular stainings of the A4I1 interneuron in first instar nymphs and adults show that general morphological features do not change during postembryonic development, in contrast to the presynaptic sensory afferents. This also holds for general morphological features of pleuroaxillary flight motoneurons. The output connections of A4I1 to these motoneurons and an unidentified intersegmental interneuron are already present in flightless nymphs. (C) 2000 Elsevier Science Ltd.

Original languageEnglish (US)
Pages (from-to)1545-1556
Number of pages12
JournalJournal of Insect Physiology
Volume46
Issue number12
DOIs
StatePublished - Nov 7 2000
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physiology
  • Insect Science

Keywords

  • Directional sensitivity
  • Electrophysiology
  • Interneurons
  • Locusta migratoria
  • Mechanoreceptors
  • Motoneurons
  • Schistocerca gregaria

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