Yes, sulci is a Scrabble word!
...and is worth 7 points in Scrabble, and 10 points in Words with Friends
sulci
Noun
1. (anatomy) any of the narrow grooves in an organ or tissue especially those that mark the convolutions on the surface of the brain
What Scrabble words can I make with the letters in sulci?
3 Letter Words
2 Letter Words