Multiple SR-T tubule junctions in a single insect flight muscle fiber

The membranes of mesothoracic dorsoventral flight muscle of Libellua needhami and Erythemis simplicicolis (Odonata: Libellulidae) were studied by transmission electron microscopy using uranyl acetate en bloc staining. Intact fibers were studied by conventional scanning electron microscopy procedures...

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Bibliographic Details
Published inJournal of ultrastructure research Vol. 84; no. 2; pp. 151 - 160
Main Authors Delcarpio, Joseph B., Baerwald, Roy J., Magnuson, Lisa J.
Format Journal Article
LanguageEnglish
Published New York Elsevier B.V 01.01.1983
Academic Press
Subjects
Biochemistry. Physiology. Immunology
Biological and medical sciences
Fundamental and applied biological sciences. Psychology
Insecta
Invertebrates
Physiology. Development
Scanning electron microscopy
Insecta
Flight
Libellulidae
Muscular fiber
Locomotion
Transmission electron microscopy
Ultrastructure
Arthropoda
Morphology
Muscle
Odonata
Invertebrata
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Summary:The membranes of mesothoracic dorsoventral flight muscle of Libellua needhami and Erythemis simplicicolis (Odonata: Libellulidae) were studied by transmission electron microscopy using uranyl acetate en bloc staining. Intact fibers were studied by conventional scanning electron microscopy procedures. Dyadic, triadic, and tetradic transverse tubule (TT)—sarcoplasmic reticulum (SR) junctions as well as plasma membrane—SR junctions are described for the first time in the same insect muscle fiber. Triadic (SR—TT—SR) and, rarely tetradic (TT—SR—TT—SR) junctions were limited to regions between adjacent myofibrils and near the ends of fibers. Dyadic (TT—SR) junctions are found between myofibrils or within indentations of slablike mitochondria. Interspecific variation in SR—TT junctional assemblies from previous similar studies is reviewed and summarized and a three-dimensional model based on SEM and TEM observations is presented.
ISSN:0022-5320
1878-2345
DOI:10.1016/S0022-5320(83)90126-0