"JESUS CHRIST: THE HEAD"...................(Ephesians 4:11-16)
I would say that a person's HEAD is the most important part of their body!  I've seen with my own eyes people go on living without an arm, leg, eye, ear, tougue, nose, teeth, appendix, lung, gall bladder, kidney...BUT NEVER WITHOUT A HEAD!  There have been heart transplants, liver transplants, and cornea replacements; artificial shoulder, hip & knee replacements....BUT NEVER A TRANSPLANTED OR ARTIFICIAL HEAD!!!  
Psalms 139:14 I will praise thee; for I am fearfully and wonderfully made: marvellous are thy works; and that my soul knoweth right well.   *When the Lord made the human body, he gave us 2 of about everything; 2 eyes, 2 ears, 2 arms, 2 legs, 2 thumbs, 2 nose-holes, 2 lungs, 2 kidneys....sometimes he increased the number of items like 32 teeth, 10 fingers & toes, millions of blood cells, trillions of body cells, (I left off FAT cells)!  BUT ONLY ONE HEAD!!!...NOBODY LIVES WITHOUT IT!

*Everything I do has a control center called the HEAD (brain).  Nothing this body does is without the HEAD's PERMISSION.  There are things that go on in my body INVOLUNTARILY...BUT THE HEAD STILL SENDS THE ORDER OUT FOR EVEN THOSE THINGS!!!-(When Saul & Jonathan where disgraced by the Philistines at Mt. Gilboa what did they do?  When Herod Antipas wished to silence John the Baptist what did he do?  Nero stopped Paul from preaching by doing what?)....Why?  because the HEAD is the FAMILIAR PART OF WHO WE ARE...IT CONTROLS ALL WE DO!

(1)-JESUS IS THE HEAD OF THE CHURCH
Ephesians 5:23 For the husband is the head of the wife, even as Christ is the head of the church: and he is the savior of the body.-(He Directs it's actions)(Holy Spirit's guidance) 

(2)-JESUS IS THE HEAD OF ALL PRINCIPALITY AND POWER
Colossians 2:10 And ye are complete in him, which is the head of all principality and power: 
Isaiah 9:6   For unto us a child is born, unto us a son is given: and the government shall be upon his shoulder: and his name shall be called Wonderful, Counsellor, The mighty God, The everlasting Father, The Prince of Peace.
Proverbs 21:1   The king's heart is in the hand of the LORD, as the rivers of water: he turneth it whithersoever he will.
(3)-JESUS IS THE HEAD OF MAN
1 Corinthians 11:3 But I would have you know, that the head of EVERY man is Christ; and the head of the woman is the man; and the head of Christ is God  *That word "EVERY" is a very powerful word!  That means nobody can be excluded! Romans 14:11-12  For it is written, As I live, saith the Lord, every knee shall bow to me, and every tongue shall confess to God. So then every one of us shall give account of himself to God.  Philippians 2:9-11-Wherefore God also hath highly exalted him, and given him a name which is above every name:  That at the name of Jesus every knee should bow, of things in heaven, and things in earth, and things under the earth; And that every tongue should confess that Jesus Christ is Lord, to the glory of God the Father.

(4)-JESUS IS THE HEAD OF THE CORNER-(Meaning "he completes the building"!)
Matthew 21:42 Jesus saith unto them, Did ye never read in the scriptures, The stone which the builders rejected, the same is become the head of the corner: this is the Lord's doing, and it is marvellous in our eyes? 
1 Peter 2:7 Unto you therefore which believe he is precious: but unto them which be disobedient, the stone which the builders disallowed, the same is made the head of the corner, 
Acts 4:11 This is the stone which was set at nought of you builders, which is become the head of the corner.