'Head' in the Bible

He is the head of the body, the church, as well as the beginning, the firstborn from among the dead, so that he himself may become first in all things.

and you have been filled in him, who is the head over every ruler and authority.

He has not held fast to the head from whom the whole body, supported and knit together through its ligaments and sinews, grows with a growth that is from God.