Fictive chewing activity in motor neurons and interneurons of the suboesophageal ganglion of Manduca sexta larvae |
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Authors: | J Rohrbacher |
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Institution: | (1) Zoologisches Institut der Universität Basel, Rheinsprung 9, CH-4051 Basel, Switzerland;(2) Present address: I. Physiologisches Institut der Universität Heidelberg, Im Neuenheimer Feld 326, D-69120 Heidelberg, Germany |
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Abstract: | Alternating antiphasic rhythmic activity was observed in opener and closer mandibular motor neurons in the isolated suboesophageal ganglion of the larva of Manduca sexta (Lepidoptera: Sphingidae). This was interpreted provisionally as fictive chewing; the pattern is similar to that seen in semiintact animals but of lower frequency. Additionally, a variety of associated rhythmic activities were observed in suboesophageal interneurons. These could be classified into several different physiological types by their activity patterns in relation to the chewing cycle. Some of these neurons can modulate the rhythm when injected with current. It seems likely that they are part of or associated with a central pattern generator circuit for chewing.Abbreviations
A
anterior
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CEC
circumoesophageal connective
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Cl-MN
closer motor neuron
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IN
interneuron
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MdN
mandibular nerve
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MN
motor neuron
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O-MN
opener motor neuron |
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Keywords: | Larval Manduca sexta Chewing behaviour Interneurons |
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