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Anterior long insular gyrus

The anterior long insular gyrus is a prominent anatomical subdivision of the insular cortex, located deep within the lateral sulcus of the human brain. This gyrus forms the anterior portion of the long gyri of the insula and is separated from the posterior long insular gyrus by the central insular sulcus. It plays a significant role in integrating sensory, emotional, and autonomic information and is vital in several cognitive and affective processes. The anterior long insular gyrus is an important landmark in both anatomical dissection and neuroimaging, owing to its clinical relevance in epilepsy, stroke, and functional brain mapping.

Synonyms:

  • Long gyrus of insula (anterior part)

  • Anterior long insular gyrus

  • Gyrus longus insulae anterior (Latin)

  • Anterior long gyrus of insula

Arterial Supply:

  • Primarily supplied by branches of the middle cerebral artery (MCA), especially the insular branches of the M2 segment.

  • Occasionally, small branches from the anterior cerebral artery (ACA) may contribute minor vascular supply.

Venous Drainage:

  • Drained mainly via the superior and inferior insular veins.

  • These veins empty into the superficial middle cerebral vein and ultimately into the vein of Labbé or other adjacent superficial venous systems.

Function:

  • Integration of visceral sensory information (autonomic sensation).

  • Involved in emotional awareness, empathy, and affective processing.

  • Plays a role in taste perception (gustation).

  • Participates in pain perception and interoceptive awareness.

  • Involvement in higher-order cognitive functions, such as attention and risk prediction.

MRI Appearance:

  • T1-weighted Images:

    • The anterior long insular gyrus appears isointense relative to other cortical gray matter.

    • Well-demarcated from adjacent white matter by its gray matter signal.

  • T2-weighted Images:

    • Hyperintense relative to white matter, similar to other cortical gray matter structures.

    • Insular cortex may be seen as a thin, continuous strip deep within the Sylvian fissure.

  • FLAIR (Fluid-Attenuated Inversion Recovery):

    • The gyrus is hyperintense relative to white matter, matching the appearance of other gray matter.

    • Pathologies such as edema, infarction, or gliosis may cause localized FLAIR hyperintensity in this region.

CT Appearance:

  • Non-contrast CT:

    • The anterior long insular gyrus is usually isodense to other cortical gray matter.

    • Insular ribbon may be obscured in early ischemic changes (insular ribbon sign).

  • Pathological States:

    • Early infarcts may show subtle loss of gray-white differentiation in the insular cortex before other cortical areas.

MRI images

anterior long insular gyrus mri axial image

MRI images

anterior long insular gyrus mri sagittal image

CT image

Anterior long insular gyrus CT sag anatomy image -img-00001-00001