Isotropic bands

In physiology, isotropic bands (better known as I bands) are the lighter bands of skeletal muscle cells (a.k.a. muscle fibers). Isotropic bands contain only actin-containing thin filaments.[1]

The darker bands are called anisotropic bands (A bands). Together the I-bands and A-bands contribute to the striated appearance of skeletal muscle.

Isotropic bands indicate the behavior of polarized light as it passes through I bands.

References
  1. Goldblum, John (2018). Rosai and Ackerman's Surgical Pathology (11 ed.). Elsevier. pp. 1810–1914.


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