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Anterior short insular gyrus

The anterior short insular gyrus is one of the prominent gyri of the insular cortex, located deep within the lateral sulcus of the brain. As the most anterior of the short insular gyri, it plays a critical role in integrating sensory, autonomic, and affective information. Understanding its anatomy, vascular supply, drainage, and imaging characteristics is essential for clinicians and radiologists, especially when evaluating insular pathology.

Synonyms:

  • Anterior short gyrus of insula

  • Anterior insular short gyrus

  • Gyrus brevis insulae anterior

  • Front short insular gyrus

Arterial Supply:

  • Supplied predominantly by the superior division of the middle cerebral artery (MCA), especially the insular branches.

  • Small perforating arteries from the MCA provide direct vascularization.

Venous Drainage:

  • Venous drainage is mainly via superior and inferior insular veins.

  • These veins drain into the deep middle cerebral vein, which then empties into the basal vein of Rosenthal.

Function:

  • Involved in multimodal sensory integration (including taste, visceral sensation, and pain).

  • Plays a role in emotional processing, autonomic regulation, and awareness of body states (interoception).

  • Associated with complex cognitive and social-emotional processes.

MRI Appearance:

  • T1-Weighted Imaging:

    • The anterior short insular gyrus appears as a gray matter structure, isointense to cortex, with sharp margins against the surrounding white matter.

  • T2-Weighted Imaging:

    • Shows relatively higher signal than white matter, with good gray-white differentiation.

  • FLAIR Imaging:

    • Hyperintense relative to white matter; FLAIR highlights any subtle lesions or edema in the insular cortex more effectively than T1 or T2.

CT Appearance:

  • On non-contrast CT, the anterior short insular gyrus is not specifically demarcated but appears as part of the insular cortex, which is slightly hypodense compared to the surrounding white matter.

  • Early ischemic changes may first become visible in the insular region due to its vulnerability to MCA infarcts.

MRI images

anterior short insular gyrus mri 3t axial image

MRI images

anterior short insular gyrus mri 3t sagittal image

CT image

Anterior short insular gyrus CT axial anatomy image -img-00001-00001