Please see the article by Gilbert Bilezikian from which I quote below: He gives some explanations of what "head" meant in the New Testament times.
"Eph. 1:22-23. The passage that immediately precedes this text exalts the supremacy of Christ in his session. But in relation to the church, the role of Christ is described as being appointed as head for the church, which is his body, the fullness of him who fills everything in every way. The headship of Christ is never over the church in the New Testament. Here, it is for the church. As head, Christ gives the church fullness. He provides for the church's growth. The function is not one of authority but of servant provider of what makes the church's growth possible.
Eph. 4:15-16. Christ is the head from whom the whole body grows and builds itself up. The function of the head in relation to the body is to provide it with growth. Headship is not an authority role but a developmental servant function.
Eph. 5:23. The husband is the head of the wife as Christ is the head of the church, his body, of which is the Savior. As head of the church, Christ is its Savior. If head had meant authority, the appropriate designation for Christ would have been "Lord" instead of "Savior" which is consistently a self-sacrificing, life-giving servant role in the New Testament.
Col. 1:18-19. Christ is the head of the body, the church; he is the beginning and the firstborn from among the dead. Through his blood, shed on the cross, all things are reconciled to God. In a passage that celebrates Christ's supremacy over all creation, this text describes Christ as the source of the life of the church through his resurrection from the dead and because of the reconciliation obtained through his self-sacrificing servant ministry at the cross. Headship is not defined in terms of authority but as servant provider of life.
Col. 2:19. Christ is the head from whom the whole body grows. The function of head in relation to the body is not one of rulership but of servant provider of growth. Christ as head to the church is the source of its life and development.
This survey indicates that head, biblically defined, means exactly the opposite of what it means in the English language. Head is never given the meaning of authority, boss or leader. It describes the servant function of provider of life, growth and development. This function is not one of top-down oversight but of bottom-up support and nurture."