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Structural organization of procerebrums of terrestrial molluscs: Characteristics of neuronal pattern, plasticity, and age peculiarities

  • Morphological Bases for Evolution of Functions
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Abstract

In terrestrial snails and slugs, the presence of five types of neurons has been shown: typical granular, horizontal, stellate, apical, and basal cells. A peculiarity of procerebrum neurons is a loop-like segment of the basal process. Granular cells have been established to spread both as cell columns and as single cells. The number of the columns and the number of cells in each column depend on the age and individual peculiarities of the animal. In the course of ontogenesis, there also occur changes of the number of processes-outgrowths of granular cell bodies as well as of the character of thickenings and the type of endings on their main processes. Basal neurons and single granular cells of the columns form several independent tracts running from the procerebrum cell body areas to metacerebrums. The single granular cells, horizontal cells, and a part of basal neurons are considered as associative elements providing formation in procerebrums of the single system that is a basis for the synchronized activity of the whole neuronal complex. A similarity of organization of procerebrums and of associative-integrative centers of higher animals is discussed.

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  1. Ukhtomskii Physiological Institute and Department of General Physiology, State University, St. Petersburg, Russia

    O. V. Zaitseva

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Zaitseva, O.V. Structural organization of procerebrums of terrestrial molluscs: Characteristics of neuronal pattern, plasticity, and age peculiarities. J Evol Biochem Phys 36, 324–333 (2000). https://doi.org/10.1007/BF02737050

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  • DOI: https://doi.org/10.1007/BF02737050

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