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The insular lobe in primates including humans.

J R Augustine

    Neurological Research
    |March 1, 1985
    PubMed
    Summary

    The human insular lobe, crucial in primates, shows distinct subdivisions and connections. Further research is needed to fully understand its complex roles in sensory processing, motor functions, and language.

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    Area of Science:

    • Neuroscience
    • Comparative Anatomy

    Background:

    • The insular lobe exhibits significant morphological differentiation in primates, reaching its peak in humans.
    • It comprises four to six gyri, concealed by opercula, and shares cytoarchitectonic similarities with the rhesus macaque insula.

    Purpose of the Study:

    • To review the anatomical connections and potential functional roles of the insular lobe in humans and primates.
    • To synthesize current knowledge on the insula's structure, connectivity, and hypothesized functions.

    Main Methods:

    • Review of recent studies on myelo- and chemoarchitectonics of the primate insula.
    • Analysis of experimental data and human observations to map insular connections and functions.

    Main Results:

    • The insular lobe connects with frontal, parietal, temporal lobes, cingulate gyrus, basal nuclei, amygdala, and dorsal thalamus.
    • Potential functions include roles as visceral sensory/motor areas, supplementary motor area, vestibular area, and involvement in speech/language.

    Conclusions:

    • The insular lobe's broad concept is outlined, but its detailed connections and functions require further investigation.
    • Future research is essential to fully elucidate the insula's complex role in the brain.

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