The Conscious is that part of the psyche that is potentially under the control of the Ego, which, as the center of the conscious, we typically relate to as I. The Conscious is a very small part of the total, or whole, psyche and is a fairly recent development in the evolution of humans.
My Ego, as the center of my consciousness, exists between the environment in which I move and the unconscious psyche and has the function of perceiving, interpreting, integrating, and adapting to the demands, often conflicting, of both. The ability of the Ego to fulfill its function varies in development from person to person, and, for the individual, development continues over the life span. The Ego can be ineffectual or excessively rigid.
To come: Persona and Shadow.