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plural sulci
(anatomy) A furrow or groove in an organ or a tissue, especially that marking the convolutions of the surface of the brain. quotations examples
The Union’s soft latex-polymer roof is cerebrally domed and a cloudy piamater pink except in spots where it’s eroded down to pasty gray, and everywhere textured, the bulging rooftop, with sulci and bulbous convolutions.
1996, David Foster Wallace, Infinite Jest […], Boston, Mass., New York, N.Y.: Little, Brown and Company, page 186
The largest sulcus, the longitudinal fissure, divides the brain into left and right hemispheres.
1999, Thomas C. Pritchard, Kevin D. Alloway, Medical Neuroscience, page 55
Unlike most other sulci, the lateral sulcus is very deep.
2006, Inderbir Singh, Textbook of Human Neuroanatomy, 7th edition, page 72
The large surface area of the human cerebral cortex results in a pattern of gyri and sulci.
2014, John Kiernan, Raj Rajakumar, Barr's The Human Nervous System: An Anatomical Viewpoint, 10th edition, page 213
(planetology) A region of subparallel grooves or ditches formed by a geological process.