| Evolutionary transformations of myoseptal tendons in gnathostomes. | |
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MedLine Citation:
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PMID: 12816635 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Axial undulations in fishes are powered by a series of three-dimensionally folded myomeres separated by sheets of connective tissue, the myosepta. Myosepta have been hypothesized to function as transmitters of muscular forces to axial structures during swimming, but the difficulty of studying these delicate complex structures has precluded a more complete understanding of myoseptal mechanics. We have developed a new combination of techniques for visualizing the three-dimensional morphology of myosepta, and here we present their collagen-fibre architecture based on examination of 62 species representing all of the major clades of notochordates. In all gnathostome fishes, each myoseptum bears a set of six specifically arranged tendons. Because these tendons are not present outside the gnathostomes (i.e. they are absent from lampreys, hagfishes and lancelets), they represent evolutionary novelties of the gnathostome ancestor. This arrangement has remained unchanged throughout 400 Myr of gnathostome evolution, changing only on the transition to land. The high uniformity of myoseptal architecture in gnathostome fishes indicates functional significance and may be a key to understanding general principles of fish swimming mechanics. In the design of future experiments or biomechanical models, myosepta have to be regarded as tendons that can distribute forces in specific directions. |
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Authors:
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Sven Gemballa; Leoni Ebmeyer; Katja Hagen; Tobias Hannich; Kathrin Hoja; Mara Rolf; Kerstin Treiber; Felix Vogel; Gerd Weitbrecht |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Proceedings. Biological sciences / The Royal Society Volume: 270 ISSN: 0962-8452 ISO Abbreviation: Proc. Biol. Sci. Publication Date: 2003 Jun |
Date Detail:
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Created Date: 2003-06-20 Completed Date: 2003-08-20 Revised Date: 2010-09-14 |
Medline Journal Info:
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Nlm Unique ID: 101245157 Medline TA: Proc Biol Sci Country: England |
Other Details:
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Languages: eng Pagination: 1229-35 Citation Subset: IM |
Affiliation:
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Evolution and Bio-Geosphere Dynamics Programme (EBID), University of Tübingen Systematic Zoology, Auf der Morgenstelle 28, D-72076 Tübingen, Germany. sven.gemballa@uni-tuebingen.de |
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| MeSH Terms | |
Descriptor/Qualifier:
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Animals Evolution* Fishes / anatomy & histology*, physiology* Muscle, Skeletal / physiology Tendons / anatomy & histology*, physiology* |
| Comments/Corrections | |
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