The structure of intersegmental muscle fibres of Scolopendra cingulata is investigated by electron microscopy. The arrangement of myofibrils, mithocondria, sarcoplasmic reticulum and T system are described. Longitudinal sections in stretched fibers show sarcomeres about $8,2 \mu$ long, and the usual bands of striated muscles. Transversal sections of the filaments reveal in A band an array of 10-12 thin filaments encircling each thick filament. The thick filament is approximately 220-240 Å and the thin one about 70 Å. The adjacent membrane surfaces of sarcoplasmic reticulum and T system (dyads), reveal a series of minute “granulations” of 250 Å, towards the reticulum cisterna and the adjoining tubule of the T system. These “granulations” are located at intervals of ca. 250-300 Å.
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Con il contributo del Ministero per i Beni e le Attività Culturali