Permanent electric polarization and pyroelectric behaviour of the vertebrate skeleton
Identifieur interne : 001406 ( Istex/Curation ); précédent : 001405; suivant : 001407Permanent electric polarization and pyroelectric behaviour of the vertebrate skeleton
Auteurs : Herbert Athenstaedt [Allemagne]Source :
- Zeitschrift für Zellforschung und Mikroskopische Anatomie [ 0044-3794 ] ; 1968-03-01.
Abstract
Summary: In a previous investigation we were able to demonstrate the presence of permanent electric polarization in human and animal tendon tissue and the existence of a permanent electric moment in tendon fibres and their collagen fibrils, as well as a pyroelectric axis in their longitudinal direction (Athenstaedt, 1967). An experimental programme has now been completed whose object it was to elucidate electric polarization in the axial and appendicular skeleton of the Vertebrata (including man). Our results will be reported in several parts of which this is the first. In addition to bony, cartilaginous and chordal tissue, our investigations also extended to other forms of supporting tissue such as intervertebral disks, periosteum and dura mater. In the chorda dorsalis of the Cyclostomata (Myxine, Petromyzon) and of Acipenser there is a permanent electric polarization in the direction of its physiologic longitudinal axis and a radial polarization in the direction of the thickness of its sheath. Both in the complete chorda dorsalis and in any random part of it (cut at right angles to its longitudinal axis) a negative electric charge is found on the cranial side and a positive charge on the caudal side. The outside of the chordal sheath has a negative charge, the inside a positive charge. These findings are correlated with the known induction effects of the chorda in embryonic development and with the structural peculiarities characterizing the chorda of vertebrates in the “money-roll” and in the adult stage. Both the cartilaginous axial skeleton of the Elasmobranchii and the bony axial skeleton of all examined specimens, from the Teleostei to the Aves, invariably showed the same pattern of permanent electric polarization: the two halves of each vertebral body, which correspond to the former sclerotome halves, are polarized in opposite directions. Thus the direction of polarization alternates constantly throughout the vertebral column along its longitudinal axis, this alternation being repeated in each fully developed vertebral body or each distinct beginning of vertebral structure. In cases of primary or secondary coalescence of vertebral bodies — e.g. in the synsacrum of adult Aves, in the urostyle of the Anura and in the cranially fused first part of the axial skeleton of Raiidae and Acipenser — the fused bony or cartilaginous rod has not an alternating but a continuous direction of polarization corresponding to that in the chorda dorsalis of the Cyclostomata and of Acipenser.
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DOI: 10.1007/BF00336989
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<record><TEI wicri:istexFullTextTei="biblStruct"><teiHeader><fileDesc><titleStmt><title xml:lang="en">Permanent electric polarization and pyroelectric behaviour of the vertebrate skeleton</title><author><name sortKey="Athenstaedt, Herbert" sort="Athenstaedt, Herbert" uniqKey="Athenstaedt H" first="Herbert" last="Athenstaedt">Herbert Athenstaedt</name><affiliation wicri:level="1"><mods:affiliation>Institute of Physiological Chemistry and Physicochemistry, Kiel University, Germany</mods:affiliation><country xml:lang="fr">Allemagne</country><wicri:regionArea>Institute of Physiological Chemistry and Physicochemistry, Kiel University</wicri:regionArea></affiliation><affiliation wicri:level="1"><mods:affiliation>Institute of Anatomy, Kiel University, Germany</mods:affiliation><country xml:lang="fr">Allemagne</country><wicri:regionArea>Institute of Anatomy, Kiel University</wicri:regionArea></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">ISTEX</idno><idno type="RBID">ISTEX:AD8D1E578FAA2143FE0B9B40FE966044A2E32AF0</idno><date when="1968" year="1968">1968</date><idno type="doi">10.1007/BF00336989</idno><idno type="url">https://api.istex.fr/document/AD8D1E578FAA2143FE0B9B40FE966044A2E32AF0/fulltext/pdf</idno><idno type="wicri:Area/Istex/Corpus">001408</idno><idno type="wicri:explorRef" wicri:stream="Istex" wicri:step="Corpus" wicri:corpus="ISTEX">001408</idno><idno type="wicri:Area/Istex/Curation">001406</idno></publicationStmt><sourceDesc><biblStruct><analytic><title level="a" type="main" xml:lang="en">Permanent electric polarization and pyroelectric behaviour of the vertebrate skeleton</title><author><name sortKey="Athenstaedt, Herbert" sort="Athenstaedt, Herbert" uniqKey="Athenstaedt H" first="Herbert" last="Athenstaedt">Herbert Athenstaedt</name><affiliation wicri:level="1"><mods:affiliation>Institute of Physiological Chemistry and Physicochemistry, Kiel University, Germany</mods:affiliation><country xml:lang="fr">Allemagne</country><wicri:regionArea>Institute of Physiological Chemistry and Physicochemistry, Kiel University</wicri:regionArea></affiliation><affiliation wicri:level="1"><mods:affiliation>Institute of Anatomy, Kiel University, Germany</mods:affiliation><country xml:lang="fr">Allemagne</country><wicri:regionArea>Institute of Anatomy, Kiel University</wicri:regionArea></affiliation></author></analytic><monogr></monogr><series><title level="j">Zeitschrift für Zellforschung und Mikroskopische Anatomie</title><title level="j" type="abbrev">Z. Zellforsch.</title><idno type="ISSN">0044-3794</idno><idno type="eISSN">1432-0878</idno><imprint><publisher>Springer-Verlag</publisher><pubPlace>Berlin/Heidelberg</pubPlace><date type="published" when="1968-03-01">1968-03-01</date><biblScope unit="volume">91</biblScope><biblScope unit="issue">1</biblScope><biblScope unit="page" from="135">135</biblScope><biblScope unit="page" to="152">152</biblScope></imprint><idno type="ISSN">0044-3794</idno></series><idno type="istex">AD8D1E578FAA2143FE0B9B40FE966044A2E32AF0</idno><idno type="DOI">10.1007/BF00336989</idno><idno type="ArticleID">BF00336989</idno><idno type="ArticleID">Art6</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0044-3794</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Summary: In a previous investigation we were able to demonstrate the presence of permanent electric polarization in human and animal tendon tissue and the existence of a permanent electric moment in tendon fibres and their collagen fibrils, as well as a pyroelectric axis in their longitudinal direction (Athenstaedt, 1967). An experimental programme has now been completed whose object it was to elucidate electric polarization in the axial and appendicular skeleton of the Vertebrata (including man). Our results will be reported in several parts of which this is the first. In addition to bony, cartilaginous and chordal tissue, our investigations also extended to other forms of supporting tissue such as intervertebral disks, periosteum and dura mater. In the chorda dorsalis of the Cyclostomata (Myxine, Petromyzon) and of Acipenser there is a permanent electric polarization in the direction of its physiologic longitudinal axis and a radial polarization in the direction of the thickness of its sheath. Both in the complete chorda dorsalis and in any random part of it (cut at right angles to its longitudinal axis) a negative electric charge is found on the cranial side and a positive charge on the caudal side. The outside of the chordal sheath has a negative charge, the inside a positive charge. These findings are correlated with the known induction effects of the chorda in embryonic development and with the structural peculiarities characterizing the chorda of vertebrates in the “money-roll” and in the adult stage. Both the cartilaginous axial skeleton of the Elasmobranchii and the bony axial skeleton of all examined specimens, from the Teleostei to the Aves, invariably showed the same pattern of permanent electric polarization: the two halves of each vertebral body, which correspond to the former sclerotome halves, are polarized in opposite directions. Thus the direction of polarization alternates constantly throughout the vertebral column along its longitudinal axis, this alternation being repeated in each fully developed vertebral body or each distinct beginning of vertebral structure. In cases of primary or secondary coalescence of vertebral bodies — e.g. in the synsacrum of adult Aves, in the urostyle of the Anura and in the cranially fused first part of the axial skeleton of Raiidae and Acipenser — the fused bony or cartilaginous rod has not an alternating but a continuous direction of polarization corresponding to that in the chorda dorsalis of the Cyclostomata and of Acipenser.</div></front></TEI></record>Pour manipuler ce document sous Unix (Dilib)
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