noun (plural crura cerebri /ˈkro͝orə/)Anatomy
Either of two symmetrical tracts of nerve fibers at the base of the midbrain, linking the pons and the cerebral hemispheres.
- This intersecting and mingling is characteristic of association bundles, and contrasts with the orderly formation of projection tracts found in the internal capsule and crus cerebri.
- Lateral pressure on the midbrain can, however, compress the opposite crus cerebri against the free edge of the tentorium, forming an indentation in the crus known as Kernohan's notch.
- The Posterior Perforated Space corresponds to a whitish-grey substance, placed between the corpora albicantia in front, the pons Varolii behind, and the crura cerebri on either side.
Early 18th century: from Latin, literally 'leg of the brain'.
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