The gyrus rectus, or straight gyrus, is a narrow strip running along the medial edge of the underside of each frontal lobe. It lies between the longitudinal fissure and the olfactory sulcus, which holds the olfactory bulb and tract. It forms part of the orbitofrontal and ventromedial prefrontal cortex.
| Location | Inferior (orbital) surface of the frontal lobe, along its medial border, medial to the olfactory sulcus |
|---|---|
| Parts |
|
| Connections | |
| Blood Supply | Anterior cerebral artery (orbitofrontal branch) |
Contributes to emotional regulation, decision making and social behaviour as part of the ventromedial prefrontal cortex.
The gyrus rectus sits just above anterior communicating artery aneurysms, which can bleed into it, and surgeons sometimes remove a small part of it to reach these aneurysms. Damage can cause personality change and memory confabulation. It is also a common site of contusion in head injury.
Bleeding from an aneurysm below the frontal lobes, which may cause haematoma in the gyrus rectus.
Bruising of the underside of the frontal lobes in head trauma, causing behavioural change.
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