Ultrastructure and Differentiation of Ascidian Muscle I. Caudal Musculature of the Larva of Diplosoma Macdonaldi

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dc.contributor.authorCavey, Michael J.en
dc.contributor.authorCloney, Richard A.en
dc.contributor.departmentBiological Sciencesen
dc.contributor.facultyFaculty of Scienceen
dc.contributor.institutionUniversity of Calgaryen
dc.date.accessioned2006-08-14T21:36:38Z
dc.date.available2006-08-14T21:36:38Z
dc.date.issued1976
dc.description.abstractThe larval caudal musculature of the compound ascidian Diplosoma macdonaldi consists of two longitudinal bands of somatic striated muscle. Approximately 800 mononucleate cells, lying in rows between the epidermis and the notochord, constitute each muscle band. Unlike the caudal muscle cells of most other ascidian larvae, the myofibrils and apposed sarcoplasmic reticulum occupy both the cortical and the medullary sarcoplasm. The cross-striated myofibrils converge near the tapered ends of the caudal muscle cell and integrate into a field of myofilaments. The field originates and terminates at intermediate junctions at the transverse cellular boundaries. Close junctions and longitudinal and transverse segments of nonjunctional sarcolemmata flank the intermediate junctions, creating a transverse myomuscular (TMM) complex which superficially resembles the intercalated disk of the vertebrate heart. A perforated sheet of sarcoplasmic reticulum (SR) invests each myofibril. The sheet of SR spans between sarcomeres and is locally undifferentiated in relation to the cross-striations. Two to four saccular cisternae of SR near each sarcomeric Z-line establish interior (dyadic) couplings with an axial analogue of the vertebrate transverse tubular system. The axial tubules are invaginations of the sarcolemma within and adjacent to the intermediate junctions of the TMM complex. The caudal muscle cells of larval ascidians and the somatic striated muscle fibers of lower vertebrates bear similar relationships to the skeletal organs and share similar locomotor functions. At the cellular level, however, the larval ascidian caudal musculature more closely resembles the vertebrate myocardium.en
dc.description.refereedyesen
dc.format.extent6291867 bytes
dc.format.mimetypeapplication/pdf
dc.identifier.citationMichael J. Cavey and Richard A. Cloney "Ultrastructure and Differentiation of Ascidian Muscle" Cell Tiss. Res. 174, 289-313 (1976)en
dc.identifier.doihttp://dx.doi.org/10.11575/PRISM/35113
dc.identifier.issn0302-766X
dc.identifier.urihttp://hdl.handle.net/1880/43423
dc.language.isoenen
dc.publisherSpringer-Verlagen
dc.publisher.urlhttp://www.springerlink.com/content/1432-0878/
dc.subjectBiologyen
dc.subject.otherAscidian larvaen
dc.subject.otherStriated muscleen
dc.subject.otherIntercellular junctionsen
dc.subject.otherSarcoplasmic reticulumen
dc.subject.otherInterior couplingsen
dc.titleUltrastructure and Differentiation of Ascidian Muscle I. Caudal Musculature of the Larva of Diplosoma Macdonaldien
dc.typejournal article
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