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PubMed1992

Somatotopic representation of the head areas in the cerebral ganglion of the snail Helix pomatia.

This study gives a detailed description of the central representation of the head regions in the cerebral ganglion after parallel nickel-lysine and cobaltic-lysine backfilling of different pairs of cerebral nerves. The backfilling of the cerebral nerves demonstrate different groups of labelled neurons in the cerebral ganglion as in the procerebrum, mesocerebrum, metacerebrum, as well as in the pleural, pedal and commissural lobes of the postcerebrum. Each head area except the anterior and posterior tentacle is represented in each labelled cell group. The tentacles are not represented in the mesocerebrum and the pedal lobe of the post-cerebrum. The different head areas in the procerebrum, metacerebrum and the pleural lobe are represented in fronto-caudal a somatotopic order.

Animals↗
PubMedDate not supplied

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

Neurophysiologists have long been seeking out simple model systems in which to analyse the neuronal mechanisms underlying the organisation of behaviour. The feeding behaviour 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 interneurones and the role of sensory inputs in the initiation and maintenance of the behaviour. 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 organisation of the feeding behaviour 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 neurones 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 present chapter 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].

Animals↗