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 Previous Article
Journal of Neuroscience, Vol 13, 1793-1803, Copyright © 1993 by Society for Neuroscience
The behavioral repertoire of the gastric mill in the crab, Cancer pagurus: an in situ endoscopic and electrophysiological examination
HG Heinzel, JM Weimann and E Marder
Department of Zoology, University of Bonn, Germany.
Simultaneous endoscopic and electrophysiological recordings were used to
observe the behavior of the gastric mill complex while recording the motor
output of the stomatogastric ganglion (STG) in intact crabs. In the crab
STG, many pattern-generating neurons are able to fire in several distinct
rhythmic motor patterns. Specifically, many neurons can switch between
firing in time with the rapid pyloric rhythm to firing in time with the
slower gastric mill rhythm (Weimann et al., 1991). We now correlate
behaviorally relevant movements of the gastric mill with some of the
modifications of neuronal firing patterns previously characterized using in
vitro STG preparations. The intracellular and extracellular recordings from
the intact crab are largely indistinguishable from those obtained from in
vitro preparations. For the first time, we describe the movements that
result as neurons switch their activity patterns associated with activation
of the gastric mill rhythm. Extracellular stimulation and intracellular
depolarization of individual motor neurons is used to determine the
relationship between frequency of firing and movement in behaving animals.
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