![]() ![]() The fornix begins as the bundle of fibers called the alveus. The fornix is a “C” shaped tract (in sagittal section). Structure of the hippocampus, uncus, crua, fornix, anterior commissure, precommissural fornix, postcommissural fornix, and columns. Each hippocampus looks like a seahorse due to the way it is folded during development. A hippocampal formation is located in the temporal lobe of each cerebral cortex, medial to the inferior horn of the lateral ventricle. The term hippocampal formation typically refers to the dentate gyrus, the hippocampus proper (i.e., cornu ammonis), and the subicular cortex. (Some experts would also include parts of the hypothalamus, thalamus, midbrain reticular formation, and olfactory areas in the limbic system.) These last three cortical areas comprise different portions of the temporal lobe. ![]() The limbic system includes the hippocampal formation, amygdala, septal nuclei, cingulate cortex, entorhinal cortex, perirhinal cortex, and parahippocampal cortex. In this case, the border is between the neocortex and the subcortical structures (diencephalon). Like the familiar word “limbo”, it means an intermediate or transitional state, which is a border. Limbic is a Latin term which means border. ![]()
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