The superior frontal gyrus is the uppermost of three horizontal gyri on the lateral frontal lobe, running forwards from the precentral sulcus and continuing over the top edge onto the medial surface. It contains much of the premotor cortex and, medially, the supplementary motor area. It is bounded below by the superior frontal sulcus.
| Location | Frontal lobe, along the upper border of the hemisphere, above the superior frontal sulcus |
|---|---|
| Parts |
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| Connections |
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| Blood Supply | Anterior cerebral artery; Middle cerebral artery (lateral edge) |
Helps plan and start voluntary movements, supports working memory and contributes to self-awareness and control of behaviour.
Lesions of its back part, especially the supplementary motor area, can cause temporary reduced movement and speech on the opposite side after surgery (SMA syndrome), which usually recovers over weeks. Damage also affects working memory and self-initiated actions. It is a common site for gliomas.
Temporary loss of spontaneous movement and speech after surgery or injury to the medial superior frontal gyrus.
Tumour of the frontal lobe that may present with seizures, personality change or weakness.
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