The fast mandible strike in the trap-jaw ant Odontomachus - II. Motor control

Research output: Contribution to journalArticle

38 Citations (Scopus)

Abstract

Ants of the ponerine genus Odontomachus employ a trap jaw mechanism for prey catching or defense. The mandible strike is released within less than 10 ms upon stimulation of particular mechanosensory trigger hairs. It is based on the storage of mechanical energy produced by the large but slow mandible closer muscle which cocks the mandible several seconds in advance of the strike. The strike is released from the catch by a small trigger muscle composed of tubular fibers. It features fast potentials and highly synchronized activation of all its muscle fibers only a few milliseconds in advance of the strike. The trigger muscle is supplied by two unusually large motor neurons that are enclosed in a glial sheath. The trap jaw action is thus controlled by a system composed of 2 giant sensory and 2 giant motor neurons on either side. The giant neurons are most likely monosynaptically coupled. The large axon diameter and the synaptic coupling result in high conduction velocity which underlies the very fast mandible reflex. The reflex activity is modulated by antennal and other sensory input probably converging onto the large dendritic trees of the trigger motor neurons.

Original languageEnglish (US)
Pages (from-to)399-408
Number of pages10
JournalJournal of Comparative Physiology A
Volume176
Issue number3
DOIs
StatePublished - May 1995
Externally publishedYes

Fingerprint

Odontomachus
mandible (bone)
Ants
Jaw
Mandible
jaws
ant
Formicidae
muscle
Motor Neurons
motor neurons
traps
Muscles
reflexes
muscles
Reflex
capture of animals
roosters
neuroglia
bycatch

Keywords

  • Fast movements
  • Giant neurons
  • Glial sheath
  • Insect
  • Muscle structure

ASJC Scopus subject areas

  • Behavioral Neuroscience
  • Neuroscience(all)
  • Physiology (medical)
  • Physiology
  • Animal Science and Zoology

Cite this

The fast mandible strike in the trap-jaw ant Odontomachus - II. Motor control. / Gronenberg, Wulfila.

In: Journal of Comparative Physiology A, Vol. 176, No. 3, 05.1995, p. 399-408.

Research output: Contribution to journalArticle

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