Subcallosal gyrus

Anatomical region of the brain

The subcallosal gyrus is a region of the brain located in the limbic system, which plays a crucial role in emotional processing and behavior. It is situated beneath the corpus callosum, a thick band of nerve fibers that connects the left and right cerebral hemispheres.

Anatomy

The subcallosal gyrus is part of the cingulate cortex, specifically located in the medial aspect of the brain. It is bordered superiorly by the corpus callosum and inferiorly by the parahippocampal gyrus. The subcallosal gyrus is continuous with the cingulate gyrus and is sometimes considered part of the ventromedial prefrontal cortex.

File:Subcallosal gyrus location.png

Diagram showing the location of the subcallosal gyrus in the human brain.

Function

The subcallosal gyrus is involved in the regulation of mood and emotional response. It is thought to play a role in depression and anxiety disorders, as it is part of the neural circuitry that processes negative emotions. The subcallosal gyrus is also involved in reward processing and decision-making, linking emotional states to cognitive functions.

Clinical significance

Dysfunction in the subcallosal gyrus has been associated with various psychiatric disorders, including major depressive disorder and bipolar disorder. It is a target for deep brain stimulation (DBS) in treatment-resistant depression, where electrical impulses are used to modulate its activity and alleviate symptoms.

Research

Recent studies using functional magnetic resonance imaging (fMRI) have shown that the subcallosal gyrus exhibits altered activity patterns in individuals with depression. These findings suggest that the subcallosal gyrus may serve as a biomarker for mood disorders and a potential target for therapeutic interventions.

Related pages

• Limbic system
• Cingulate cortex
• Prefrontal cortex
• Deep brain stimulation