'Head' in the Bible

He is also the head [the life-source and leader] of the body, the church; and He is the beginning, the firstborn from the dead, so that He Himself will occupy the first place [He will stand supreme and be preeminent] in everything.

And in Him you have been made complete [achieving spiritual stature through Christ], and He is the head over all rule and authority [of every angelic and earthly power].

and not holding fast to the head [of the body, Jesus Christ], from whom the entire body, supplied and knit together by its joints and ligaments, grows with the growth [that can come only] from God.