This brief study was made as a corollary to previous experimental work on additional motor areas of the macaque monkey. The region of the island cortex is shown in figures 6A and B, as it relates to the opercular areas of the matching cerebrum. Although there is not general agreement as to the homology of the insula (von Bonin and Bailey, '47, Frontera, '56) of monkey with that of man, it appears that two varieties of cortex can be distinguished in both. Von Bonin and Bailey ('47) describe agranular cortex at the limen as the dominant histologic feature, although some granular cortex is found in the caudal part of the insula. Several authors (von Bonin and Bailey, '47; Kaada, Pribram and Epstein, '49 and Kaada, '51) emphasized the presence of discernible rostra1 motor cortex and caudal sensory cortex in the island.Frontera's ('55) description of the macaque insula will be used as reference here. Branches of the middle cerebral artery divide the island into a dorsorostral portion and a ventrocaudal portion without there being evidence of true gyri and sulci ( fig. 6A). The dorsorostral insula is covered by the frontoparietal operculum of the Walker ('40) areas 6, 4, and 1, and the ventrocaudal region by the temporal operculum of area 22 of the superior temporal gyrus ( fig. 6B).
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