A bands
Definition: the dark-staining anisotropic cross striations in the myofibrils of muscle fibers, comprising regions of overlapping thick (myosin) and thin (actin) filaments.
Synonym(s): A discs, anisotropic discs, Q bands1, Q discs
Definition: the dark-staining anisotropic cross striations in the myofibrils of muscle fibers, comprising regions of overlapping thick (myosin) and thin (actin) filaments.
Synonym(s): A discs, anisotropic discs, Q bands1, Q discs