One of the mysteries of the English language finally explained.
1With of and in the genitive, especially in "fissure of Rolando". Designating the central sulcus, which separates the frontal and parietal lobes on the superolateral surface of the brain, and forms the border between the primary motor and somatosensory areas of the cortex.
2With of, in the genitive, and attributive Designating the substantia gelatinosa, a layer of somewhat translucent tissue that forms the apical part of the posterior grey columns of the spinal cord.
Mid 19th century; earliest use found in Todd's Cyclopaedia of Anatomy and Physiology. Fromthe name of Luigi Rolando, Italian anatomist, who described the central sulcus in 1825 and the substantia gelatinosa in 1828.
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