14.6 POJA-L6165 Electron micrograph of two ring fibres in skeletal muscle (human)
14.6 POJA-L6165 Electron micrograph of two ring fibres in skeletal muscle
14.6 POJA-L6165 Electron micrograph of two ring fibres in skeletal muscle (human)
(By courtesy of L. Eshuis BSc Section Electron microscopy, Department of Pathology, Radboud university medical center, Nijmegen, The Netherlands)
Title: Electron micrograph of two ring fibres in skeletal muscle (human)
Description:
In ring fibres the normal orientation of the myofibrils is deformed because bundles of myofibrils run at right angles to the main body of the fibre. In a low survey the green arrow indicates the circularly winded myofilaments around the central core (red arrow) of longitudinally arranged myofilaments. (*) is the subsarcolemmal nucleus of the ring fibre. The outer circular fibre displays regular sarcomeres with well-defined Z-lines, A- and I-bands. The central core shows cross sections of bundles of myofilaments. Note the numerous dense spots (**) presenting partly tangential sectioned Z-line areas.
Occasionally these ring fibres might be detected in normal muscles, however more often in myotonic dystrophies although not pathognomonic.
See also:
Title: Electron micrograph of two ring fibres in skeletal muscle (human)
Description:
In ring fibres the normal orientation of the myofibrils is deformed because bundles of myofibrils run at right angles to the main body of the fibre. In a low survey the green arrow indicates the circularly winded myofilaments around the central core (red arrow) of longitudinally arranged myofilaments. (*) is the subsarcolemmal nucleus of the ring fibre. The outer circular fibre displays regular sarcomeres with well-defined Z-lines, A- and I-bands. The central core shows cross sections of bundles of myofilaments. Note the numerous dense spots (**) presenting partly tangential sectioned Z-line areas.
Occasionally these ring fibres might be detected in normal muscles, however more often in myotonic dystrophies although not pathognomonic.
See also:
- 14.1 POJA-L6089+6090+6091 Skeletal muscles with ring fibres (human)