Convolution

(kon-vo-lii* ’-shun) \_convolvere, to roll together]. A fold, twist, or coil of any organ, especially any one of the prominent convex parts of the brain, separated from each other by depre ions or sulci. C, Angular, the posterior part of a convolution situated between the intraparietal fi ure in front and above, and the horizontal limb of the Sylvian fi ure, and the hinder part of the first part of the first temporal fi ure below. The anterior part is called the supra marginal convolution. C, Annectant, small convolutions which connect the occipital with the temporosphenoidal and parietal lobes. C, Anterior Central, C, Ascending Frontal, the convolution in front of the fi ure of Rolando. C, Ascending Parietal, the convolution just behind the fi ure of Rolando. C, Broca’s, the inferior or third frontal convolution. C, Fornicate, a long convolution on the mesial surface of the brain above the corpus callosum. C, Frontal, the convolutions of the frontal lobe. C, Hippocampal, the part of the fornicate convolution that winds around the splenium of the corpus callosum. C, Insular, the small convolutions composing the island of Reil. C, Marginal, the mesial surface of the first frontal convolution. C, Occipital, the convolutions making up the occipital lobe. C, Para central, a convolution on the mesial surface of the brain, representing the junction of the upper ends of the ascending frontal and ascending parietal convolutions. C, Parietal, the convolutions of the parietal lobe. C, Posterior Central. See C., Ascending Parietal. C, Supra marginal. See C., Angular. C, Temporal, the convolutions of the temporal lobe. C, Uncinate, the hook-like termination of the fornicate convolution. 207