This crucial structure, then, can be used for several approaches, which are based on the concept of the identified neurone: (1) Ontogenetical studies: addressing the question of when during ontogeny is this neurone present in its final (adult) form? (2) Homonomy (“serial homology”): addressing the question as to how far this element is reiterated along a segmented body.
Finally, the basic structure of the element in question should be constructed. Primarily, such a study is independent of whether different profiles are attributed to genetic or epigenetic programs. Studies of identified neurones at a distinct place within a species are required to understand how far variability or plasticity exert an influence on an individual structure.
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