The fornices are a pair of large C-shaped fiber bundles that travel mostly within the lateral ventricles. They leave the posterior hippocampus in the temporal horn of the lateral ventricle, arch over the thalamus through the body of the lateral ventricle, and then dive down in front of the thalamus to enter the mammillary body of the hypothalamus. This long curved pathway, from the hippocampi to the mammillary bodies, is the most dramatic link in the Papez circuit (of the limbic system).
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