[TA] the area of cerebral cortex located internal to the lateral sulcus and separated from the adjacent frontal, parietal, and temporal opercula by the circular sulcus of the insula; composed of short and long gyri separated by the central sulcus of the insula. See also: insula. Synonym(s): insular lobe ☆ , lobus insularis ☆ , insular part, pars insularis