The crus cerebri is the large band of descending fibres on the front of each half of the midbrain. It carries motor fibres from the cerebral cortex to the brainstem and spinal cord.
| Location | Ventral midbrain, forming the front of each cerebral peduncle, on either side of the interpeduncular fossa |
|---|---|
| Parts |
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| Connections |
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| Blood Supply | Posterior cerebral artery; Anterior choroidal artery; Basilar artery perforators |
Conveys voluntary motor commands from the cortex downwards.
A midbrain stroke here causes weakness of the opposite body with a same-side third nerve palsy (Weber syndrome). In brain herniation the opposite crus can be pushed against the tentorium, causing weakness on the same side as the mass (Kernohan notch).
Midbrain stroke causing opposite-side weakness and same-side oculomotor palsy.
Compression of the opposite crus in herniation, causing a misleading same-side weakness.
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