Муж - голова, жена - шея, куда захочет, туда и повернет

It is the wife who virtually makes all the decisions though the husband seems to play the main role. See Жена - в доме глава (Ж)

Cf: The grey mare is the better horse (Br.). The husband is the head of the house, but the wife is the neck - and the neck moves the head (Am.)