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On the Organisation of the Sarcotubular Systems in the Caudal Muscle Cells of Larvaceans (Tunicata)
Author(s) -
Bone Quentin,
Flood P. R.,
Mackie G. O.,
Singla C. L.
Publication year - 1977
Publication title -
acta zoologica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.414
H-Index - 37
eISSN - 1463-6395
pISSN - 0001-7272
DOI - 10.1111/j.1463-6395.1977.tb00255.x
Subject(s) - endoplasmic reticulum , biology , myofilament , anatomy , muscular system , myocyte , microbiology and biotechnology
The structure of the sarcotubular systems of the caudal muscle cells is described in various larvaceans. In Oikopleura there is both a transverse tubular system and a sarcoplasmic reticulum; there are internal couplings between the two and also sarcolemmal couplings. In Fritillaria (and probably also in Kowalevskaia ), a transverse tubular system is lacking, and there are only sarcolemmal couplings with the sarcoplasmic reticulum, which is related to the mitochondria as well as to the myofilaments. The significance of these differences is discussed, and it is concluded that the arrangement of the sarcotubular systems is related to muscle fibre thickness; within the Tunicata, these systems do not indicate phylogenetic relationships.