Morphology of interneurons in the procerebrum of the snailHelix aspersa

Ratté, Stéphanie; Chase, Ronald

doi:10.1002/(sici)1096-9861(19970804)384:3<359::aid-cne4>3.0.co;2-2

Cited by 30 publications

(1 citation statement)

References 26 publications

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“…Thus, there are three parallel pathways from the sensory pad primary neurons used in olfactory processing: to glomeruli, to interneurons of a tentacular ganglion, and direct projections to the cerebral ganglia (Chase and Tolloczko, 1993; Ierusalimsky and Balaban, 2007). The PC lobe is a division of the cerebral ganglion unique to terrestrial slugs and snails that is specialized for the processing (third stage) of olfactory information (Ratte and Chase, 1997). The PC lobe in terrestrial snails and slugs spontaneously produces a periodic slow oscillations of local field potential (Gelperin and Tank, 1990; Chase and Tolloczko, 1993; Kleinfeld et al, 1994; Nikitin and Balaban, 1999, 2000).…”

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confidence: 99%

Changes in frequency of spontaneous oscillations in procerebrum correlate to behavioural choice in terrestrial snails.

Samarova

Balaban

2009

Front. Cell. Neurosci.

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The aim of our study was to understand functional significance of spontaneous oscillations of local field potential in the olfactory brain lobe of terrestrial snail, the procerebrum (PC). We compared changes in frequency of oscillations in semi-intact preparations from snails trained to percept the same conditioned odor as positive (associated with food reinforcement) or negative (associated with noxious reinforcement). In vivo recordings in freely behaving naïve snails showed a significant decrease of spontaneous PC oscillations frequency during a stage of tentacle withdrawal to odor presentation. In in vitro preparations from naïve snails, a similar decrease in frequency of the PC oscillations to odor presentation was observed. Changes in frequency of the oscillations to cineole presentations in the “aversive” group of snails (demonstrating withdrawal) were much more pronounced than in naïve snails. No significant difference in responses to 5% and 20% cineole was noted. Changes in the spontaneous oscillations frequency in the snails trained to respond with positive reaction (approach) to cineole depended on the concentration of the applied odor, and these responses were qualitatively similar to responses of other groups during the first 10 s of responses to odor, but significantly different (increase in PC oscillations frequency) from the responses of the aversively trained and naïve snails in the interval 11–30 s, which corresponds to the end of the tentacle withdrawal and timing of decision making (approach or escape) in the free behaving snails. Obtained results suggest that frequency of the PC lobe spontaneous oscillations correlate to the choice of behavior in snails: withdrawal (decrease in frequency) or approach (increase in frequency) to the source of odor.

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Section: Introductionmentioning

confidence: 99%

Changes in frequency of spontaneous oscillations in procerebrum correlate to behavioural choice in terrestrial snails.

Samarova

Balaban

2009

Front. Cell. Neurosci.

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Topographic organization of serotonergic and dopaminergic neurons in the cerebral ganglia and their peripheral projection patterns in the head areas of the snailHelix pomatia

Hernádi¹,

Elekes²

1999

J. Comp. Neurol.

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The distribution of monoaminergic neurons within the cerebral ganglia was investigated in the pulmonate snail Helix pomatia. Simultaneous serotonin and tyrosine hydroxylase double immunostaining revealed that the immunoreactive cell groups are concentrated in a putative monoaminergic center on the ventral surface of the cerebral ganglia. Simultaneous cobalt (Co)‐ and nickel (Ni)‐lysine backfills of cerebral nerves were combined with 5,6‐dihydroxytryptamine pigment‐labelling of serotonergic neurons, or with fluorescence immunocytochemistry of dopaminergic neurons. This showed that the serotonergic and dopaminergic cell groups can be divided into smaller subgroups on the basis of their axonal projections into different cerebral nerves. These subgroups show a topographic organization within the serotonergic and dopaminergic neuronal clusters. In the serotonergic system, the different regions of the head are represented in a rostrocaudal direction, whereas a caudorostral organization is characteristic for the dopaminergic system. No serotonin‐ or dopamine‐immunoreative cell bodies but numerous fibers were observed in the head areas, indicating that these are innervated by cerebral monoaminergic neurons and show different innervation patterns. Serotonin‐immunoreactive fibers mostly innervate muscle fibers, whereas dopamine‐immunoreactive processes do not innervate effector cells, but terminate within the nerve branches of the head areas. On the basis of their innervation pattern, we suggest that dopaminergic neurons may take part in en route modulation of sensory afferent and efferent processes in an as yet unknown manner. The serotonergic neurons, on the other hand, may play a direct role in the modulation of muscle function. J. Comp. Neurol. 411:274–287, 1999. © 1999 Wiley‐Liss, Inc.

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Synapse distribution of olfactory interneurons in the procerebrum of the snailHelix aspersa

Ratté

Chase

2000

J. Comp. Neurol.

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The procerebrum is believed to be important for processing olfactory information and storing olfactory memories in terrestrial pulmonate molluscs. Previous results have demonstrated that the procerebral cell population is morphologically heterogeneous. In the present study, serial sections and electron microscopy were used to investigate differences in synapse distributions. The results demonstrate that procerebral neurons with different sites of arborization have distinct patterns of synapse distribution that probably reflect different functional contributions to the olfactory pathway. Cells that have all their arborizations in the procerebrum, but none in the internal mass, have multiple large varicosities that are specialized for output. On the other hand, cells that arborize in the internal mass or outside the procerebrum have mostly input synapses proximal to the soma and mostly output synapses in the terminal region of the neurites. These cells appear to transmit information from the procerebral cell body mass to other central nervous system regions, e.g., the internal mass and the mesocerebrum. The implications of these data are twofold. Firstly, the procerebrum directly participates in distributing processed olfactory information to more central regions of the nervous system. Secondly, the procerebral neuronal population may be divisible into two subgroups: 1) intrinsically arborizing interneurons; and 2) projection neurons. This is significant because the neural organization of the procerebrum may now be compared with that of olfactory systems in other organisms.

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Morphology of interneurons in the procerebrum of the snailHelix aspersa

Cited by 30 publications

References 26 publications

Changes in frequency of spontaneous oscillations in procerebrum correlate to behavioural choice in terrestrial snails.

Changes in frequency of spontaneous oscillations in procerebrum correlate to behavioural choice in terrestrial snails.

Topographic organization of serotonergic and dopaminergic neurons in the cerebral ganglia and their peripheral projection patterns in the head areas of the snailHelix pomatia

Synapse distribution of olfactory interneurons in the procerebrum of the snailHelix aspersa

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