external capsule


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Related to external capsule: Extreme capsule

external capsule

n.
A thin layer of white substance in the brain that separates the claustrum from the lentiform nucleus.
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One important point is that in the majority of the cases the insular arteries primarily supply the insular cortex, extreme capsule, and, occasionally, the claustrum and external capsule, but not the putamen, globus pallidus, or internal capsule, which are vascularized by the lateral lenticulostriate arteries (LLAs), although some thicker branches from M2 may anastomose with the LAAs.
Predominantly affected regions are frontal, parietal, and anterior temporal, followed by external capsule.
Symmetrical bilateral hyperintensities on T2W images were also seen in external capsule, internal capsule, fornix, extreme capsule, corpus callosum and head of caudate nucleus.