The paracentral lobule is a U-shaped area on the medial surface of the hemisphere where the precentral and postcentral gyri continue over the top edge. It surrounds the end of the central sulcus and is bounded below by the cingulate sulcus. It contains the motor and sensory areas for the opposite leg and foot.
| Location | Medial surface of the hemisphere, around the upper end of the central sulcus, above the cingulate sulcus |
|---|---|
| Parts |
|
| Connections |
|
| Blood Supply | Anterior cerebral artery (paracentral branch) |
Controls movement and receives sensation for the opposite leg and foot, and contributes to voluntary control of bladder and bowel.
Lesions cause weakness and sensory loss mainly in the opposite leg, a pattern typical of anterior cerebral artery stroke. Because the bladder control area is nearby, damage on both sides (for example from a parasagittal meningioma) can cause spastic weakness of both legs with urinary incontinence, mimicking a spinal cord lesion.
Weakness and sensory loss of the opposite leg more than arm, from paracentral lobule infarction.
Tumour beside the falx that may compress both paracentral lobules, causing leg weakness and incontinence.
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