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Definition of Lobe

  • 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.

Lobe: Part of an organ that appears to be separate in some way from the rest. A lobe may be demarcated from the rest of the organ by a fissure (crack), sulcus (groove), connective tissue or simply by its shape. For example, there are the frontal, parietal, temporal, and occipital lobes of the brain.

The word "lobe" from the Greek lobos meaning "a small rounded projection" long applied only to the familiar round projection at the base of the ear -- the earlobe. The lobes of the brain, thyroid, lungs, and liver were hardly mentioned in English until the 16th century.

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Reviewed on 12/11/2018

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