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The fornix ((ラテン語:arch)) is a C-shaped bundle of nerve fibers in the brain that carries signals from the hippocampus to the mammillary bodies and then to the anterior nuclei of thalamus. The fornix is part of the limbic system. While its exact function and importance in the physiology of the brain is still not entirely clear, it has been demonstrated in humans that surgical transection – the cutting of the fornix along its body – can cause memory loss. There is some debate over what type of memory is affected by this damage, but it has been found to most closely correlate with recall memory rather than recognition memory. This means that damage to the fornix can cause difficulty in recalling long-term information such as details of past events, but it has little effect on the ability to recognize objects or familiar situations. ==Structure== The fibres begin in the hippocampus on each side of the brain as fimbria; the separate left and right sides are each called the crus of the fornix (plural ''crura''). The bundles of fibres come together in the midline of the brain, forming the ''body'' of the fornix. The lower edge of the septum pellucidum (the membrane that separates the lateral ventricles) is attached to the upper face of the fornix body. The body of the fornix travels anteriorly and divides again near the anterior commissure. The left and right parts separate, but there is also an anterior/posterior divergence. * The posterior fibres (called the ''postcommissural fornix'') of each side continue through the hypothalamus to the mammillary bodies; then to the anterior nuclei of thalamus, which project to the cingulate cortex. * The anterior fibers (''precommissural fornix'') end at the septal nuclei and nucleus accumbens of each half of the brain. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Fornix (neuroanatomy)」の詳細全文を読む スポンサード リンク
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