左脳 is read as さのう (sanou) and means left brain.
さのう
sanou
さわん
left arm
ひだりとう
left-wing party
さへん
left side (go, chess, othello board)
さがん
left bank (of a river)
ひだりはんしん
left half of the body
さきほそく
following supplements
ひだりてのほうそく
(Fleming's) left-hand rule
さへんち
left side value (of an equation)
さだいじん
Minister of the Left (official in Nara and Heian periods)
させつか
left turn permissible
さゆうぎゃく
left and right reversed
さわんとうしゅ
left-handed baseball pitcher