HealthAugust 5, 2026

callosum

kuh-LOSS-um

Definition

The thick band of nerve fibers that connects the left and right hemispheres of the brain, allowing for communication between them.

Etymology

Derived from the Latin 'corpus callosum,' meaning 'tough body.' It was named for the dense, firm, and white appearance of the nerve tissue found in this structure.

In the news

The article mentions the corpus callosum when discussing 'alien hand syndrome,' noting that damage to this structure can result in independent, unintended movements of a hand.

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