The corona radiata is the fan of projection fibres that spreads out from the top of the internal capsule to all parts of the cerebral cortex. It carries both descending motor fibres and ascending thalamic fibres. Above the lateral ventricles it merges with association and commissural fibres in the centrum semiovale.
| Location | Deep cerebral white matter between the internal capsule and the cortex, lateral to the lateral ventricles |
|---|---|
| Connections |
|
| Blood Supply | Deep medullary branches of the cerebral arteries; Lenticulostriate arteries |
Connects the cortex with the internal capsule, carrying motor commands down and sensory signals up.
Small vessel disease often affects the corona radiata, producing lacunar infarcts and white matter changes on MRI. Lesions here can cause weakness that affects one limb more than another, since fibres are more spread out than in the internal capsule. It is also a common site for multiple sclerosis plaques.
A deep infarct that causes weakness of the opposite side, often arm or leg predominant.
Age and blood pressure related damage to deep white matter that may slow thinking and walking.
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