A band

A band
A band n one of the cross striations in striated muscle that contain myosin filaments and appear dark under the light microscope and light in polarized light

* * *

[anisotropic] the dark-staining zone of a sarcomere, whose center is traversed by the paler H band, which in turn contains the darker M band; called also A disk, Q disk, anisotropic disk, and transverse disk.

Electron micrograph (A) and diagrammatic representation (B) of a sarcomere, showing the arrangement of the A, H, I, M, and Z bands in the thick and thin filaments of striated muscle.


Medical dictionary. 2011.

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