The brain is located in the skull and made up of marrow. As one of the extraordinary organs, it is where the essence, marrow and spirit concentrate and originate. It is primarily involved in governing life activities, mental activities, senses, and movements. 1) Governing life activities: The brain is thought as the pivot of life and is responsible for all human life activities. 2) Governing mental activities, including mind, consciousness and emotions, etc., which are the reflections of external environment and phenomena. 3) Governing senses and movements: The brain controls all movements of the limbs, as the brain controls the original vitality which dominates qi movement.