crus cerebri

anatomy

Also known as: crura cerebri

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Last updated

July 15, 2026

Quick Summary

The crus cerebri is a significant part of the midbrain's tegmentum. It consists of descending nerve fibers that connect the cerebral cortex to the cerebellum and spinal cord. These tracts are crucial for voluntary motor control and skilled movements. The crus cerebri is a major component of the descending spinal tracts, including the corticospinal tract, which originates in broad regions of the cerebral cortex and plays a vital role in voluntary motor function.123

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midbrain
…within the midbrain are the crus cerebri, tracts made up of neurons that connect the cerebral hemispheres to the cerebellum. The midbrain also contains a portion of the reticular formation, a neural network that is involved in arousal and alertness. Cranial nerves in the midbrain that stimulate the muscles controlling…
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…within the midbrain are the crus cerebri, tracts made up of neurons that connect the cerebral hemispheres to the cerebellum. The midbrain also contains a portion of the reticular formation, a neural network that is involved in arousal and alertness. Cranial nerves in the midbrain that stimulate the muscles controlling…
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human nervous system
Pons
These massive crossed fibers, called crus cerebri, form the middle cerebellar peduncle and serve as the bridge that connects each cerebral hemisphere with the opposite half of the cerebellum. The fibers originating from the cerebral cortex constitute the corticopontine tract.
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These massive crossed fibers, called crus cerebri, form the middle cerebellar peduncle and serve as the bridge that connects each cerebral hemisphere with the opposite half of the cerebellum. The fibers originating from the cerebral cortex constitute the corticopontine tract.
Read More