Mapping of contralateral projections in the central olfactory pathway in the moth species helicoverpa armigera and heliothosis virescens
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- Institutt for psykologi 
Olfaction is phylogenetically the most primitive sense. It is also a sense that evokes a lot of feelings in us humans, from disgust to nostalgic childhood memories. Olfaction is primarily an ipsilaterally organized system in most species, contrary to other sensory system which are primarily contralaterally organized. There are however some evidence of contralateral projections in insect olfactory systems. In this study such contralateral projections are investigated in the moth species Helicoverpa armigera and Heliothosis virescens. Evidence for some contralateral projectional axons are obtained and described. However, they are few in numbers. Their anatomy and what processes these neurons may be implemented in is discussed. However, the pictures obtained underline the ipsilateral organization of the olfactory system. This leads to the intriguing question of why this sensory system is so differently arranged compared to other sensory systems. Conclusion wise it is discussed whether this is a result of the early phylogenetically nature of this sensory system, that it evolved before other sensory systems, and therefore is a precursor and a necessity for the development of a centralized nervous system.