Gross anatomic features of 16 formalin-fixed normal human insulae
| Insular Gyri and Sulci | Well Seen-Complete | Well Seen-Incomplete/Partial/Hypoplastic | Poorly Seen | Not Seen |
|---|---|---|---|---|
| CS | 94 (15) | 6 (1) | - | - |
| Anterior surface of insula | ||||
| Transverse gyrus | 100 (16) | - | - | - |
| Accessory gyrus | 100 (16) | - | - | - |
| Convexity surface; anterior lobule of insula | ||||
| ASG | 94 (15) | 6 (1) | - | - |
| MSG | 56 (9) | 31 (5) | - | 12 (2) |
| PSG | 94 (15) | 6 (1) | - | - |
| SIS | 75 (12) | 12 (2) | 6 (1) | 6 (1) |
| PIS | 75 (12) | 19 (3) | - | 6 (1) |
| Convexity Surface: posterior lobule of insula | ||||
| ALG | 81 (13) | 19 (3) | - | - |
| PLG | 56 (9) | 38 (6) | 6 (1) | - |
| PostCS | 56 (9) | 38 (6) | 6 (1) | - |
| Overhanging opercula | ||||
| HG | 100 (16) | - | - | - |
| Subcentral gyrus | 100 (16) | - | - | - |
| Supramarginal gyrus | 100 (16) | - | - | - |
Note.—Data are percentages (number of specimen). SIS indicates short insular sulcus; PIS, precentral insular sulcus.