Medical Definition of Gyrus

  • Medical Author:
    William C. Shiel Jr., MD, FACP, FACR

    Dr. Shiel received a Bachelor of Science degree with honors from the University of Notre Dame. There he was involved in research in radiation biology and received the Huisking Scholarship. After graduating from St. Louis University School of Medicine, he completed his Internal Medicine residency and Rheumatology fellowship at the University of California, Irvine. He is board-certified in Internal Medicine and Rheumatology.

Gyrus: A convolution on the surface of a cerebral hemisphere caused by the infolding of the cerebral cortex. The gyri are bounded by crevices in the cortex called sulci. Many gyri are constant enough in their occurrence as anatomic features that they have been given names as, for example, the cingulate gyrus, the dentate gyrus, and so on. From the Greek gyros = a circle.

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Reviewed on 12/21/2018

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