Olfactory Inputs to a Bursting Serotonergic Interneuron in a Terrestrial Mollusc

Egan, Michael E.; Gelperin, Alan

doi:10.1093/oxfordjournals.mollus.a065560

Cited by 21 publications

(10 citation statements)

References 2 publications

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“…The input, i.e., the olfactory system in Helix, and other terrestrial snails, has been investigated in some detail (HanstriSm 1925;Schulz 1938, Chase 1986Chase and Tolloczko 1993). Responses to odor stimuli have been recorded in tentacular neurons (Chase 1981;1985), central neurons (Egan and Gelperin 1981) and in the procerebral lobe (Gelperin 1990;Gelperin and Tank 1990). Comparative studies of the sensory responses of naive and food-conditioned snails to odor stimulation may provide a first indication of the site of plasticity: Are the sensory elements more sensitive to stimulation with the conditioned odor, or is the plasticity of the motor output due to central processing stages?…”

Section: Neuronal Correlate Of Behavioral Plasticitymentioning

confidence: 99%

Consequences of food-attraction conditioning in Helix: a behavioral and electrophysiological study

1996

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Food-attraction conditioning is a learning phenomenon by which adult Helix pomatia acquire the ability to locate food through exposure to that particular food. Food-conditioned snails can be distinguished from 'naive' snails during their approach to food. 'Naive' snails keep their tentacles upright whereas 'food-conditioned' animals bend the tentacles downward, in a horizontal orientation, pointed in the direction of the food. Tentacle musculature is innervated by two peritentacular nerves (PTn), each projecting to approximately one hemi-section of the tentacle wall. Stimulating the peritentacular nerves caused the tentacles to bend downward in a manner reflecting the full complement of tentacle movements performed by conditioned snails. The neural correlate of tentacle movements was investigated in isolated ganglion preparations with the posterior tentacles attached. PT nerve activity was recorded while the olfactory epithelia were stimulated with natural food odors. Preparations obtained from conditioned animals responded with a substantial increase in unit activity (mean increase 280%) to stimulation with odor of the conditioned food but not to other odors. Preparations from naive animals did not respond to food odor stimulation. The electrophysiological results demonstrated that plasticity due to conditioning the snails in vivo survived dissection and could be monitored in vitro.

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Section: Neuronal Correlate Of Behavioral Plasticitymentioning

confidence: 99%

Consequences of food-attraction conditioning in Helix: a behavioral and electrophysiological study

1996

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“…Only two of these target areas have been studied in any detail, the dendritic field of a n identified neuron and the neuropil of the procerebrum. It is known that one large identified neuron, the metacerebral giant, is responsive to electrical stimulation of the tentacle nerve (Kandel and Tauc, 1966) and well as to chemical stimulation of the olfactory organ (Egan and Gelperin, 1981). In the light microscope, we have traced fibers of the tentacle nerve to terminations lying in close proximity to dendrites of the metacerebral giant cell (Chase and Tolloczko, 1992).…”

Section: The Cerebral Ganglion (Brain)mentioning

confidence: 99%

Tracing neural pathways in snail olfaction: From the tip of the tentacles to the brain and beyond

Chase

Tolloczko

1993

Microscopy Res & Technique

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The anatomical organization of the olfactory system of terrestrial snails and slugs is described in this paper, primarily on the basis of experiments using the African snail Achatina fulica. Behavioral studies demonstrate the functional competence of olfaction in mediating food finding, conspecific attraction, and homing. The neural substrate for olfaction is characterized by an extraordinarily large number of neurons relative to the rest of the nervous system, and by the fact that many of them are unusually small. There exist multiple serial and parallel pathways connecting the olfactory organ, located at the tip of the tentacle, with integrative centers in the central nervous system. Our methods of studying these pathways have relied on the selective neural labels horseradish peroxidase and hexamminecobaltous chloride. One afferent pathway contains synaptic glomeruli whose ultrastructure is similar to that of the glomeruli seen in the mammalian olfactory bulb and the insect olfactory lobe. All of the olfactory neuropils, but especially the tentacle ganglion, contain large numbers of morphologically symmetrical chemical synapses. The procerebrum is a unique region of the snail brain that possesses further features analogous with olfactory areas in other animal groups. Olfactory axons from the tentacle terminate in the procerebrum, but the intrinsic neurons do not project outside of it. An output pathway from the procerebrum to the pedal ganglion has been identified and found to consist of inter-ganglionic dendrites. The major challenge for future studies is to elucidate the pattern of connectivity within, rather than between, the various olfactory neuropils.

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“…

Neurophysiologists have long been seeking simple model systems in which to analyze the neuronal mechanisms underlying the organization of behavior. However, in only less than half of them was the analysis extended to the effect of tactile and chemical inputs on identified neurons in the buccal and cerebral ganglia which contain the feeding circuitry (Aplysia: [12,22,36,41 ]; Pleurobranchaea: [9,16,17]; Tritonia: [2]; Helisona: [21]; Limax: [11,14,35]; Helix [6, 19, 24-26, 32, 38]).In the present work I would like to review our earlier findings on the processing of mechano and chemosensory information in the lip nerves and cerebral ganglia of Helix pomatia L. These findings were published in a series of papers between 1982 and 1987 [19, 20, 24-26]. Considerable progress has been made in one or both of the first two aspects of this research in Lymnaea, Helisoma, Limax, Planorbarius, Pleurobranchaea, and Trironia (for reviews see [3,7,8,15]), and more recently, in Aplysia [39] and Planorbis [1].

The role of mechano-and chemosensory inputs in the organization of the feeding behavior was studied in at least twenty molluscan species (for a review see [3]).

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mentioning

confidence: 99%

Processing of mechano- and chemosensory information in the lip nerve and cerebral ganglia of the snailHelix pomatia L.

Kemenes

1994

Neurosci Behav Physiol

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Neurophysiologists have long been seeking simple model systems in which to analyze the neuronal mechanisms underlying the organization of behavior. The feeding behavior of molluscs has proved to be one of the most useful simple systems for the analysis of cyclical motor patterns, the interactions of central pattern generating interneurons, and the role of sensory inputs in the initiation and maintenance of the behavior. Considerable progress has been made in one or both of the first two aspects of this research in Lymnaea, Helisoma, Limax, Planorbarius, Pleurobranchaea, and Tritonia (for reviews see [3, 7, 8, 15]), and more recently, in Aplysia [39] and Planorbis [1]. The role of mechano- and chemosensory inputs in the organization of the feeding behavior was studied in at least twenty molluscan species (for a review see [3]). However, in only less than half of them was the analysis extended to the effect of tactile and chemical inputs on identified neurons in the buccal and cerebral ganglia which contain the feeding circuitry (Aplysia: [12, 22, 36, 41]; Pleurobranchaea: [9, 16, 17]; Tritonia: [2]; Helisona: [21]; Limax: [11, 14, 35]: Helix: [6, 19, 24-26, 32, 38]). In the present work I would like to review our earlier findings on the processing of mechano and chemosensory information in the lip nerves and cerebral ganglia of Helix pomatia L. These findings were published in a series of papers between 1982 and 1987 [19, 20, 24-26]. The results reviewed here prepared the way for the development of new lines of research in our laboratory on the plasticity and serotonergic modulation of feeding in this widely used experimental animal [27, 40].

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Olfactory Inputs to a Bursting Serotonergic Interneuron in a Terrestrial Mollusc

Cited by 21 publications

References 2 publications

Consequences of food-attraction conditioning in Helix: a behavioral and electrophysiological study

Consequences of food-attraction conditioning in Helix: a behavioral and electrophysiological study

Tracing neural pathways in snail olfaction: From the tip of the tentacles to the brain and beyond

Processing of mechano- and chemosensory information in the lip nerve and cerebral ganglia of the snailHelix pomatia L.

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