The Fornix System and Related Hippocampal Connections
One of the most prominent fiber systems of the forebrain is the fornix, which becomes obvious at the level of the anterior poles of the hippocampus. At this level, the total fornix bundle is actually composed of the fibers of the fimbria and the more medially located fibers of the dorsal fornix. From this point of convergence, the fibers arch downward (“fornix” means arch) and split into two components: a rather diffuse component that descends through the septum anterior to the level of the anterior commissure into the preoptic area and a more compact postcommissural component that descends to the mammillary bodies. The series of coronal and parasagittal sections in Figure 5-1 shows the general topography of this fiber bundle.
KeywordsDentate Gyrus Entorhinal Cortex Anterior Commissure Mammillary Body Septal Nucleus
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