Ultrastructural Studies on the Gastrointestinal Nervous System of Helix pomatia

Ábrahám, A. (1983) Ultrastructural Studies on the Gastrointestinal Nervous System of Helix pomatia. ACTA BIOLOGICA (SZEGED), 29 (1-4). pp. 129-136. ISSN 0563-0592

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Abstract

The gastrointestinal nervous system is made up of neurons, nerve fibres, glia cells and glia fibres The neurons are large and sharply defined towards the surroundings. They contain many endoplasmic reticules having wide lumen, as well as free ribosomes and ribosomes arranged in rows. Mitochondria and lysosomes are few in number. Neurosecretory granules are characteristic, among which dense-core forms and larger homogeneous oval granules can also be detected. The chromatin is found close to the nuclear membrane in the form of indented lobules. One part of the nerve fibres contains large amounts of neurosecretory granules the other part is prevalent in the dense-core forms. There are added to the nerve fibres of granule content, the agranular fibres containing no granules, as well as glia cells and glia fibres. Many glycogen granules can be found in the latter two. Their characteristic components are the gliogranules.

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