It matters not what part of the body you are, the real message is that He is the Head and you are to function as He gives instruction in harmony with His will.

Christ is the Head and therefore He should control all of our functions automatically. As the brain says to the hand move, it moves even without our conscious effort. This is the relationship we are to have with Christ as His mind becomes our mind and He controls our thoughts and actions as we do His will.

18 And he is the head of the body, the church: who is the beginning, the firstborn from the dead; that in all things he might have the preeminence. (KJV)

Colossians 2:9-10

9 For in him dwelleth all the fullness of the Godhead bodily.

10 And ye are complete in him, which is the head of all principality and power: (KJV)

I Corinthians 12:12

12 For as the body is one, and hath many members, and all the members of that one body, being many, are one body: so also is Christ. (KJV)

 I Corinthians 12:18

18 But now hath God set the members every one of them in the body, as it hath pleased him. (KJV)

I Corinthians 12:27

27 Now ye are the body of Christ, and members in particular. (KJV)

Ephesians 5:21-23

21 Submitting yourselves one to another in the fear of God.

22 Wives, submit yourselves unto your own husbands, as unto the Lord.

23 For the husband is the head of the wife, even as Christ is the head of the church: and he is the saviour of the body. (KJV)

Romans 12:4-5

4 For as we have many members in one body, and all members have not the same office:

5 So we, being many, are one body in Christ, and every one members one of another. (KJV)