And the very God of peace sanctify you wholly; and I pray God your whole spirit and soul and body be preserved blameless unto the coming of our Lord Jesus Christ. I Thessalonians 5:23 KJV

Paul lists 'spirit and soul and body' in that order, which I take to be significant and which I take to mean that the spirit ought to be considered first in such considerations.

Hebrews 4:12 KJV, makes a distinction between soul and spirit in reference to the material body :

For the word of God is quick, and powerful, and sharper than any twoedged sword, piercing even to the dividing asunder of soul and spirit, and of the joints and marrow, and is a discerner of the thoughts and intents of the heart.

Here, the immaterial soul and spirit are likened to parts of the material body, namely the functional parts of the skeleton (the joints) which allow of movement and mechanical activity; and the living tissue of that functioning mechanism (the marrow) which is the living tissue within that mechanical structure.

Thus I understand that spirit is the unique living being of existence ; that soul is a non-material construct that allows the inner spirit to engage in non-material aspects of human existence (such as activities of the mind) ; and that the material body is the living organism functioning in the substantial world through the inhalation of oxygen from the atmosphere.

Is this what Reformed Protestantism teaches or does it teach something different from what I have understood from scripture ?