The precentral sulcus runs parallel to the central sulcus, just in front of it, forming the front border of the precentral gyrus. It is often broken into superior and inferior parts, and the superior and inferior frontal sulci usually join it. The junction of the superior frontal and precentral sulci is a common landmark on MRI.
| Location | Lateral surface of the frontal lobe, anterior to and parallel with the central sulcus |
|---|---|
| Parts |
|
| Connections | |
| Blood Supply | Middle cerebral artery (precentral or prerolandic branch) |
Marks the front border of the primary motor cortex and separates it from the premotor areas.
Radiologists use the meeting point of the superior frontal sulcus and precentral sulcus to find the precentral gyrus and therefore the motor cortex. The premotor cortex and frontal eye field lie just in front of it. Lesions straddling it can affect both motor execution and movement planning.
Damage just in front of the precentral sulcus that impairs planning and sequencing of movements more than strength.
A tumour near the precentral sulcus that may cause seizures or weakness by affecting the motor strip.
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