Fragmentation occupies a pivotal and contested position across the depth-psychological corpus, operating simultaneously as a clinical symptom, a developmental mechanism, an epistemological condition, and — in certain mythopoeic readings — a necessary stage in the evolution of consciousness. At the clinical end, trauma theorists such as Herman, Van der Hart and colleagues, and Heller treat fragmentation as the psychobiological consequence of overwhelming experience: the self’s coherence breaks apart under unbearable arousal, producing dissociated self-representations, split internal working models, and the sequential or parallel compartmentalization of traumatic memory across discrete ego-states or personality parts. For these writers, fragmentation is simultaneously a defensive achievement and a developmental failure — the price paid for survival at the cost of integration. Schwartz’s Internal Family Systems model reframes this landscape, arguing that while trauma intensifies the felt sense of fragmentation, parts themselves are innate rather than trauma-generated. Neumann introduces the most ambitious counterpoint: from the standpoint of the history of consciousness, fragmentation of a primordial archetype into a ‘sizable group of related archetypes and symbols’ is the very mechanism by which ego consciousness protects itself from numinous overwhelm and advances toward differentiated awareness. McGilchrist approaches fragmentation from neurological phenomenology, identifying left-hemispheric dominance as the source of perceptual and experiential disintegration. Across all these registers the term marks the boundary between wholeness and pathology, primitivity and differentiation, protective necessity and therapeutic goal.