ABSTRACT
There are many more fibers in the hippocampal fields and the subicular complex than there are fibers in the main efferent fornix/fimbria system. Apparently, relays from several neurons in the hippocampal fields connect with each neuron in the subicular complex. According to Swanson (1978),only 20% or less of the pyramidal cells send relays outside the hippocampal formation. All parts of the hippocampal formation except the dentate fascia and the entorhinal cortex project to various structures outside the hippocampal formation. As mentioned in chapter 20, the entorhinal region and the dentate fascia seem to be receiving areas for sensory-limbic afferents. They send relays to various hippocampal areas, and the pyramids in these areas then initiate an impulse to action—whether that is movement, recall, or imagination.
