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Structure of the cerebellum (reptilian brain) and organization of cells is quite different from the more recently evolved neo-cortex (mammalian brain).  Construction of the cerebellum is divided into the outmost molecular layer, Purkinje layer and granule layer.  The most predominant cell types are the Purkinje and granule cells.

Reptilian brain
Two staged cell assembly construction The cerebellum is based on a two staged cell assembly construction (granulePurkinje), as illustrated to the left.  This may be compared to the three staged construction of the neo-cortex.

The following pages summarize the component cell features and assembly structure of the cerebellum, and describe how HNeT models this architecture.