Jung concept of collective unconscious is based on his experiences with schizophrenic persons since he worked in the Burgholzli psychiatric hospital.
Though initially Jung followed the Freudian theory of unconscious as the psychic strata formed by repressed wishes, he later developed his own theory on the unconscious to include some new concepts. The most important of them is the archetype.
Archetypes constitute the structure of the collective unconscious - they are psychic innate dispositions to experience and represent basic human behavior and situations. Thus mother-child relationship is governed by the mother archetype. Father-child - by the father archetype. Birth, death, power and failure are controlled by archetypes. The religious and mystique experiences are also governed by archetypes.