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.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.