The frontal lobe is the largest lobe, lying in front of the central sulcus and above the lateral sulcus. It contains the primary motor cortex, premotor and supplementary motor areas, the frontal eye fields, Broca area (usually on the left) and the large prefrontal cortex. It is central to voluntary movement, speech production, planning and personality.
| Location | Anterior part of each hemisphere, in front of the central sulcus and above the lateral sulcus, resting on the anterior cranial fossa |
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| Connections |
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| Blood Supply | Anterior cerebral artery; Middle cerebral artery |
Plans and executes voluntary movement, produces speech, controls eye movements, and supports executive functions such as planning, working memory, attention, impulse control and social behaviour.
Frontal lesions can cause weakness of the opposite side, expressive (Broca) aphasia, and changes in behaviour such as apathy, disinhibition and poor judgement, sometimes with few obvious motor signs. Frontal release signs (grasp and pout reflexes) may appear. The frontal poles are a common site of contusion in head injury because they strike the anterior cranial fossa.
Personality change, poor planning, apathy or disinhibition after frontal damage from injury, tumour or stroke.
Degeneration of frontal and temporal lobes causing early behavioural and language change, often in people under 65.
Bruising of the frontal lobes against the skull base in head injury, often affecting judgement and behaviour.
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