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The nervous system in planarians: Peripheral and gastrodermal plexuses, pharynx innervation, and the relationship between central nervous system structure and the acoelomate organization by Jaume Baguñà; Rafael Ballester is a Environmental Science article available to read on EtoBox.

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## Abstract The Champy‐Maillet osmium tetroxide‐zinc iodide technique and a new method using azur B‐sodium thioglycolate were used to study the general nervous tissue structure in planarians. A subepidermal and a submuscular nerve plexus, partially reported by earlier authors, are described, and a gastrodermal plexus is reported for the first time in triclads. The possible functions for each one of these plexuses are discussed. By the Champy‐Maillet method, the innervation within the parenchyma appears as an array of numerous single nerve fibers that course between the parenchyma cells making apparent synaptic contacts. The pharynx has outer and inner nerve nets similar in structure to the submuscular nerve plexus. Both nerve nets are connected to each other by radial nerves. The central nervous system has a sponge‐like structure with many lacunae filled with cell bodies, dorso‐ventral muscle fibers, parenchymal cell processes and excretory ducts. The existence of this sponge‐like nervous tissue structure is discussed in relation to the still incomplete centralization of the nervous tissue in these organisms, to the lack of a true vascular system and to the acoelomate level of orga

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Author

Jaume Baguñà; Rafael Ballester

Publisher

John Wiley and Sons; Wiley (John Wiley & Sons); John Wiley & Sons Inc.; Wiley (ISSN 0362-2525)

Published

1978

Language

EN

Field

Environmental Science (Physical Sciences)