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sulcus (n.)

plural sulci, "fissure between convolutions of the brain," 1833, from medical use of Latin sulcus "furrow, trench, ditch, wrinkle," apparently literally "the result of plowing," from PIE *selk- "to pull, draw" (source also of Greek holkos "furrow," Old English sulh "plow," Lithuanian velku "I draw").

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Definitions of sulcus

sulcus (n.)
(anatomy) any of the narrow grooves in an organ or tissue especially those that mark the convolutions on the surface of the brain;
From wordnet.princeton.edu