Answer: sulci

AnswerCrossword Clue
SULCIBrain grooves: Anat.
SULCIGrooves, in anatomy
SULCIBrain furrows
sulcifurrow or groove
sulcishallow furrow on the surface of the brain separating adjacent convolutions
sulcigroove or fissure, esp. a fissure between two convolutions of the brain
sulciSULCUS, a long narrow furrow
sulcifurrow groove