Summary
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1.
The pyloric motor output pattern of the stomatogastric ganglion (StG) of the crabCancer pagurus, as recorded from the lateral ventricular nerve (lvn), has been analysed in terms of synaptic interactions of the pyloric motoneurones.
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2.
A technique which allows intracellular recording from pyloric neurones in situ is described.
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3.
An hypothesis on the mechanism of operation of command fibres during reflex activation has been derived from extracellular recordings and is tested directly in the in situ preparation.
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4.
The command input to the pyloric dilator (PD) pacemaker neurones alone is shown to be responsible for major modifications of the pyloric output pattern.
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5.
That command fibres excite only the pacemaker neurones is supported by experiments performed on the isolated stomatogastric system with stimulation of command fibres separated from the superior oesophageal nerve (son) and simulation of excitatory synaptic input to a pacemaker by depolarizing current injection.
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6.
Similar output modifications of the pyloric cycle can be recorded from the intact animal.
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7.
An interpretation of the spontaneous pyloric output pattern as well as of the psn-evoked pattern modifications is given.
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References
Atwood, H.L., Wiersma, C.A.G.: Command interneurons in the crayfish central nervous system. J. exp. Biol.46, 249–261 (1967)
Bowerman, R.F., Larimer, J.L.: Command fibres in the circumoesophageal connectives of crayfish. J. exp. Biol.60, 95–117 (1974)
Bowerman, R.F., Larimer, J.L.: Command neurons in crustaceans. Comp. Biochem. Physiol.54, 1–5 (1976)
Dando, M.R., Chanussot, B., Nagy, F.: Activation of command fibres to the stomatogastric ganglion by input from a gastric mill proprioceptor in the crabCancer pagurus. Mar. Behav. Physiol.2, 197–228 (1974)
Dando, M.R., Laverack, M.S.: The anatomy and physiology of the posterior stomach nerve (psn) in some decapod crustacea. Proc. roy. Soc.171, 465–482 (1969)
Dando, M.R., Selverston, A.I.: Command fibres from the supraoesophageal to the stomatogastric ganglion inPanulirus argus. J. comp. Physiol.78, 138–175 (1972)
Davis, W.J., Kennedy, D.: Command interneurons controlling swimmeret movements in the lobster. J. Neurophysiol.35, 1–30 (1971)
Hartline, D.K., Maynard, D.M.: Innervation and neuromuscular physiology of intrinsic foregut muscles in the blue crab and spiny lobster. J. comp. Physiol.96, 185–204 (1975)
Hermann, A.: Neurale Integration in einem einfachen Nerven-System. Untersuchungen am stomatogastrischen System vonCancer pagurus. Thesis (1976)
Kandel, E.R., Kupferman, I.: Invertebrate ganglia. Ann. Rev. Physiol.32, 193–258 (1970)
Maynard, D.M.: Neural coordination in a simple ganglion. Science158, 531–532 (1967)
Maynard, D.M.: In: The interneuron (Mary A.B. Brazier, Ed.), pp. 58–70. Berkeley, California: University of California Press (1969)
Maynard, D.M.: Simpler networks. Ann. N.Y. Acad. Sci.193, 59–72 (1972)
Maynard, D.M., Burke, W.: Electrotonic junctions and negative feedback in the stomatogastric ganglion of the mud crab,Scylla serrata. Amer. Zool.6, 95 (1966)
Maynard, D.M., Dando, M.R.: The structure of the stomatogastric neuromuscular system inCallinectes sapidus, Homarus americanus andPanulirus argus. Phil. Trans. B268, 161–220 (1974)
Maynard, D.M., Selverston, A.I.: Organization of the stomatogastric ganglion of the spiny lobster. IV. The pyloric system. J. comp. Physiol.100, 161–182 (1975)
Maynard, D.M., Walton, K.D.: Effects of maintained depolarization of presynaptic neurons on inhibitory transmission in lobster neuropil. J. comp. Physiol.97, 215–243 (1975)
Mendelson, M.: Oscillator neurons in crustacean ganglia. Science171, 1170–1173 (1970)
Mulloney, B., Selverston, A.I.: Organization of the stomatogastric ganglion of the spiny lobster. I. Neurons driving the lateral teeth. J. comp. Physiol.91, 1–32 (1974a)
Mulloney, B., Selverston, A.I.: Organization of the stomatogastric ganglion of the spiny lobster. III. Coordination of the two subsets of the gastric system. J. comp. Physiol.91, 53–78 (1974b)
Nagy, F., Dando, M.R.: Modification du programme moteur de ganglion stomatogastrique par stimulation d'un nerf sensonel stomacal chez le crabbe,Cancer pagurus. C.R. Acad. Sci. (Paris)276, 599–602 (1973)
Pantin, C.F.A.: In: Notes on microscopical technique for zoologists. Cambridge: Cambridge University Press (1976)
Selverston, A.I.: Structural and functional basis of motor pattern generation in the stomatogastric ganglion of the lobster. Amer. Zool.14, 957–972 (1974)
Selverston, A.I., Mulloney, B.: Organization of the stomatogastric ganglion of the spiny lobster. II. Neurons driving the medial tooth. J. comp. Physiol.91, 33–51 (1974)
Watanabe, A., Obara, S., Akiyama, T.: Acceleratory synapses on pacemaker neurons in the heart ganglion of a stomatopod,Squilla oratoria. J. gen. Physiol.54, 212–230 (1969)
Watanabe, A., Shosaku, O., Toyohiro, A.: Pacemaker potentials for the periodic burst discharge in the heart ganglion of a stomatopod,Squilla oratoria. J. gen. Physiol.50, 839–862 (1967)
Wiersma, C.A.G.: The neuron soma. Neurons of arthropods. Cold Spr. Harb. Symp. quant. Biol.17, 153–163 (1952)
Wiersma, C.A.G., Ikeda, K.: Interneurones commanding swimmeret movements in the crayfishProcambarus clarkii (Girand). Comp. Biochem. Physiol.12, 509–525 (1964)
Wilkens, J.L., Wilkens, L.A., McMahon, B.R.: Central control of cardiac and scaphognathite pacemakers in the crab,Cancer magister. J. comp. Physiol.90, 89–104 (1974)
Wilson, D.M.: Neural operations in arthropod ganglia. In: The neurosciences, Vol. II, pp. 379–409 (Schmitt, F.O., Ed). Cambridge, Mass.: M.I.T. Press (1970)
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This work was performed at the Max-Planck-Institute for Psychiatry (Munich) and partly at the Gatty Marine Laboratory, The University of St. Andrews, Scotland. It was supported by S.R.C. Grant No. B/RG/17249 to Professor M.S. Laverack and a European Training Program Grant in Brain and Behavior Research to A. Hermann. We would like to thank Dr. H.D. Lux for support of this work and Dr. C. Heyer for many valuable discussions and review of the manuscript.
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Hermann, A., Dando, M.R. Mechanism of command fibre operation onto bursting pacemaker neurones in the stomatogastric ganglion of the crab,Cancer pagurus . J. Comp. Physiol. 114, 15–33 (1977). https://doi.org/10.1007/BF00656806
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DOI: https://doi.org/10.1007/BF00656806