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The shelf surrounding an island is known as an "insular shelf." The continental margin , between the continental shelf and the abyssal plain , comprises a steep continental slope, surrounded by the flatter continental rise , in which sediment from the continent above cascades down the slope and accumulates as a pile of sediment at the base of ...
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The insular lobe is a portion of the cerebral cortex that has invaginated to lie deep within the lateral sulcus. It sits like an island (the meaning of insular ) almost surrounded by the groove of the circular sulcus and covered over and obscured by the insular opercula.
It is the lateral most limit of the anterior perforated substance and the starting point of the insular cortex. The limen insulae translates as the threshold to the insula, and is the point at which the insular cortex is continuous with cortex over the amygdala and superior temporal gyrus.
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The insular cortex is divided by the central sulcus of the insula, into two parts: the anterior insula and the posterior insula in which more than a dozen field areas have been identified. The cortical area overlying the insula toward the lateral surface of the brain is the operculum (meaning lid ).
The Insular Islands were an extended chain of volcanic islands forming an arc in what is now the Pacific Ocean during the Paleozoic and Mesozoic eras. The islands formed by subduction and melting of the Farallon Plate along a fragment (or microplate) upon which they rose called the Insular Plate .
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