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FIG 5. A–D, Imaging anatomy of the normal insula in a 51-year-old man. Sequential sagittal T2-weighted MR imaging sections from lateral (A) to medial (D) demonstrate the anterior (APS), superior (SPS), and inferior (IPS) PS, the ASG (a), MSG (m), and PSG (p) of the larger anterior lobule, and the ALG (A) and the branched configuration of the PLG (P) of the smaller posterior lobule. The CS (d) courses across the convexity between the precentral gyrus (4) and the postcentral gyrus (5) and then curves across the insula between the corresonding gyri of the insula (ie, between p and A). The overlying opercula interdigitate with the insular gyri with no significant distortion of insular anatomy. The HG (H) lies immediately behind the PLG and marks the posteroinferior border of the insula. M indicates middle frontal gyrus; I, inferior frontal gyrus; 6, supramarginal gyrus; 8, superior temporal gyrus; and 11, subcentral gyrus. Other abbreviations as in Figs 1–4.
