Subtle body. The somatic unconscious, a transcendental concept involving the relationship between mind and body.
The part of the unconscious which is designated as the subtle body becomes more and more identical with the functioning of the body, and therefore it grows darker and darker and ends in the utter darkness of matter. . . . Somewhere our unconscious becomes material, because the body is the living unit, and our conscious and our unconscious are embedded in it: they contact the body. Somewhere there is a place where the two ends meet and become interlocked. And that is the [subtle body] where one cannot say whether it is matter, or what one calls "psyche."[ Nietzsche's Zarathustra, vol. 1, p. 441.]