(3.1) The cerebral spinal system of nerves is the organ of the conscious mind.
Along the Ego|Self axis, conscious mind may be understood as the black lines on the figure below.
(2.4) Conscious mind has the faculty of discrimination. It has the power of reasoning. It is the seat of the will and may impress the subconscious.
Discrimination, in this sense, does not imply prejudice. In Vedanta, “discrimination” is the faculty of mind responsible for deliberate and intentional choice.
(3.2) The sympathetic system of nerves is the organ of the subconscious mind.
Along the Ego|Self axis, subconscious mind may be understood as the white interior, between the black lines, on the figure below.
(2.3) The value of the subconscious is enormous. It guides us. It warns us. It controls the vital processes and is the seat of memory.
The more habitual our decisions and the less we consider the consequences of our words and actions, the more translucent consciousness (the black lines) become. If our subconscious is reinforcing Self, this can be great, but if our subconscious is reinforcing our ego identity, then we are inviting suffering into our life.
(2.5) Conscious mind is reasoning will. Subconscious mind is instinctive desire, the result of past reasoning will.
Hallgrimskirkja, Reykjavik, Iceland