User:Graeme E. Smith/TriSynaptic Pathway and Direct connections in the Entorhinal Cortex and hippocampus: Is all implicit memory a Two Stage Process?

Recent work on the Entorhinal Cortex, seems to suggest that there are two separate ways that it addresses the hippocampus areas, the Trysynaptic Pathway, which is the expected route, and a direct access pathway, which accesses each individual neuron. Marr's model of the Cerebellum seemed to have two access techniques too, suggesting that there might need to be a confirmation step before memories were locked into the exact pyramidal neuron at the implicit level of each memory. In this article I explore the idea that the disappearing mossy dendrite neurons perform one of the two steps, while the horizontal (Tangential Fiber) System in laminae I of the cerebral neocortex might offer the second to the laminae 2/3 pyramidal neurons in Allocortical and Isocortical neocortex tissue. This suggests that the mossy dendrites play a confirmation role that becomes redundant once the neurons are charged and disappear by Adulthood because that role is no longer needed.

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