Ultrastructural observations on the central innervation of the guinea-pig pineal gland |
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Authors: | T. Schneider P. Semm L. Vollrath |
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Affiliation: | (1) Department of Anatomy, Johannes Gutenberg-University, Mainz, Federal Republic of Germany;(2) Anatomisches Institut, Johannes Gutenberg-Universität, Saarstrasse 19-21, D-6500 Mainz, Federal Republic of Germany |
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Abstract: | Summary In the present study the central innervation of the guinea-pig pineal gland was investigated. The habenulae and the pineal stalk contain myelinated and non-myelinated nerve fibres with few dense-cored and electron-lucent vesicles. Some myelinated fibres leave the main nerve fibre bundles, lose their myelin-sheaths and terminate in the pineal gland. Although direct proof is lacking, the non-myelinated fibres appear to end near the site where the bulk of the myelinated fibres are located. Here a neuropil area exists where synapses between non-myelinated fibre elements are abundant. Neurosecretory fibres were also seen. The results support the concept of functional interrelationships between hypothalamus, epithalamus and the pineal gland. |
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Keywords: | Pineal gland (guinea-pig) Innervation Synapses |
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