Fornix of the brain

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Brain: Fornix of the brain
Diagram of the fornix. Right=anterior
Scheme of rhinencephalon.
Latin Fornix
Gray's p.838
NeuroNames hier-250
MeSH Fornix+(Brain)
NeuroLex ID birnlex_705

The fornix (Latin, "vault" or "arch") is a C-shaped bundle of fibers (axons) in the brain, and carries signals from the hippocampus to the hypothalamus. The fornix is part of the limbic system.


The fibres begin in the hippocampus on each side of the brain (where they are also known as the fimbria); the separate left and right sides are each called the crus of the fornix. The bundles of fibres come together in the midline of the brain, forming the body of the fornix. The inferior edge of the septum pellucidum (a membrane that separates the two 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.

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