Journal article

About the T-system in the myofibril-free sarcoplasm of the frog muscle fibre

  • Voigt, Tilman Anatomy unit, Medicine Department, University of Fribourg, Switzerland
  • Dauber, Wolfgang Institute of Anatomy, Eberhard-Karls-University Tuebingen, Germany
Published in:
  • Tissue and Cell. - 2004, vol. 36 (4), p. 245-248
English Previous investigations of the T-system in skeletal muscle fibres described the inter-myofibrillar relationships between T-tubules and the sarcoplasmic reticulum. They disregarded the arrangement of the T-system in the myofibril-free sarcoplasm in the area of muscle fibre nuclei. In the present investigation, the T-system was filled by means of lanthanum incubation and the myofibril-free sarcoplasm was ultrastructural examined by means of thin (≤100 nm) as well as thick sections (>300 nm–1 μm) with the electron microscope. The investigation of thick sections revealed that T-tubules meander through this myofibril-free sarcoplasm and tangle up at the poles of muscle fibre nuclei and in the area of fundamental nuclei of the motor end plate. They are, far from myofibrils, in proximity to these nuclei, the Golgi apparatus and mitochondria. On basis of this proximity and their openings at the muscle fibre surface, a contribution at the drainage of metabolic products and at the local calcium control is discussed.
Faculté des sciences et de médecine
Département de Médecine
  • English
Biological sciences
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