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A peculiar myofibrillar pattern in the murine muscletendon junction

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The muscle-tendon junctions of adult mice show a special arrangement of myofibrils. Essentially, the myofibrils are oriented in an anchor-like manner in the large finger-shaped processes of the muscle fiber, which contain “mitochondrial sacks” (Demmel et al. 1979) in a subsarcolemmal position. Furthermore, the single myofibril frequently branches out into smaller fibrils. It is suggested that due to the three-dimensional arrangement, these processes gain a high rigidity during contraction, thus maintaining their shape and preserving the “mitochondrial sacks”.

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Correspondence to Dr. H. Michna.

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Michna, H. A peculiar myofibrillar pattern in the murine muscletendon junction. Cell Tissue Res. 233, 227–231 (1983).

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  • Muscle-tendon junction
  • Ultrastructure
  • Myofibrillar pattern
  • M. flexor digitorum longus
  • Mouse