=====Extreme capsule=====
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The extreme capsule (Latin: capsula extrema) is a long association fiber pathway of white matter in the brain that provides bidirectional communication between such areas as the [[claustrum]] and the [[insula]]r cortex, and the [[inferior frontal gyrus]] (Broca’s area) and the middle-posterior portion of the [[superior temporal gyrus]] (Wernicke's area).

Its fibers are near to but can be distinguished by MRI tractography from adjacent fiber bundles such as the [[uncinate fasciculus]], the external capsule, the arcuate fascicle, and the medial, inferior and [[superior longitudinal fasciculus]].

Given its bidirectional connection between the Broca's and Wernicke's speech areas it could have a role in language.

It is most easily visible in a horizontal section, just lateral to the claustrum.