Ring Fiber

A peripheral myofilament that is reoriented and encircles the other myofibres of the same bundle; there are thus central, longitudinal fibres, surrounded by fibres, which to some eyes, mimic the back of a ‘spiral’ notebook; these fibres show no evidence of phagocytosis nor regeneration and are a subtle, albeit non-specific histological marker which may be seen in myotonic dystrophy