| gyri breves insulae | Several short, radiating gyri converging toward the base of the insula, composing the anterior two-thirds of the insular cortex. Synonym: gyri breves insulae. (05 Mar 2000) |
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| gyri insulae | The short gyri of insula and long gyrus of insula. Synonym: gyri insulae. (05 Mar 2000) |
| gyrus longus insulae | The most posterior and longest of the slender straight gyri that compose the insula. Synonym: gyrus longus insulae. (05 Mar 2000) |
| sulcus circularis insulae | A saemicircular fissure demarcating the insula from the opercula above, below, and behind. Synonym: sulcus circularis insulae, circular sulcus of Reil, limiting sulcus of Reil. (05 Mar 2000) |
| limen insulae | The band of transition between the anterior portion of the gray matter of the insula and the anterior perforated substance; it is formed by a narrow strip of olfactory cortex along the lateral side of the lateral olfactory stria. Synonym: threshold of island of Reil. (05 Mar 2000) |