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HistologyTypes of tissuesMuscle tissueI band
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HistologyTypes of tissuesMuscle tissueI band

I band

Author: Danijel Tosovic, PhD • Reviewer: Dimitrios Mytilinaios, MD, PhD
Last reviewed: March 19, 2024
Reading time: 1 minute

Recommended video: Skeletal muscle tissue [12:25]
This type of tissue is found in skeletal muscles and is responsible for the voluntary movements of bones.
I band
Stria I
1/2
Synonyms: Isotropic band, Discus isotropicus

The I band (isotropic band) is the light band of the sarcomere located between the two myosin (thick) filaments and contains only the actin (thin) filaments of two neighboring sarcomeres. Bisecting the I band and serving as an anchoring point for the two adjacent actin filaments is the Z disc. Either side of the I band is the A band which contains the entirety of the thick filaments. 

During a muscle contraction, as the overlap of actin and myosin increases, the I band, as well as the H zone, will shorten, while the A band retains its width. 

Terminology English: I band
Latin: Stria I
Definition Light band of the sarcomere containing actin filaments of neighboring sarcomeres
Function Shortens during a muscle contraction as actin filaments are pulled towards the M line

Learn more about the structure of skeletal muscle with this study unit (and article):

Skeletal muscle Explore study unit
Muscles and muscle tissue Read article

Sources

All content published on Kenhub is reviewed by medical and anatomy experts. The information we provide is grounded on academic literature and peer-reviewed research. Kenhub does not provide medical advice. You can learn more about our content creation and review standards by reading our content quality guidelines.

Standring, S. (2016). Gray's Anatomy (41st ed.). Edinburgh: Elsevier Churchill Livingstone.

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