Fornix of brain
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| Brain: Fornix of brain | ||
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| Diagram of the fornix. Right=anterior | ||
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| Scheme of rhinencephalon. | ||
| Gray's | subject #189 838 | |
| NeuroNames | hier-250 | |
| MeSH | Fornix+(Brain) | |
The fornix (Latin, "vault" or "arch") is a C-shaped bundle of fibres (axons) in the brain, and carries signals from the hippocampus to the mammillary bodies and septal nuclei.
The fibres begin in the hippocampus on each side of the brain; the separate left and right side 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.
When the body is formed from the two crura (sing. crus), there is a small number of fibres that cross over to the other side at what is called the hippocampal commissure. Most fibres stay on their original side.
The body of the fornix travels anteriorly and divides again near the anterior commissure. The left and right parts reseparate, 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. The anterior fibers (precommissural fornix) end at the septal nuclei of each half of the brain.
Additional images
 Velum interpositum. |
 Mesal aspect of a brain sectioned in the median sagittal plane. |
 Coronal section of brain through intermediate mass of third ventricle. |
 Coronal section of lateral and third ventricles. |
 Central part and anterior and posterior cornua of lateral ventricles exposed from above. |
 Tela chorioidea of the third ventricle, and the choroid plexus of the left lateral ventricle, exposed from above. |
 Diagram showing the positions of the three principal subarachnoid cisternæ. |
External links
- Photo at umdnj.edu
- BrainMaps at UCDavis Fornix
- Roche Lexicon - illustrated navigator, at Elsevier 13048.000-3
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Some of the initial content on this page may be incorporated in part from copyleft sources in the public domain including wikis such as Wikipedia and AskDrWiki. Drug information for patients came from the The National Library of Medicine. Infectious disease information may have come from the Centers for Disease Control (CDC). Differential Diagnoses are drawn from clinicians as well as an amalgamation of 3 sources: 1.The Disease Database; 2. Kahan, Scott, Smith, Ellen G. In A Page: Signs and Symptoms. Malden, Massachusetts: Blackwell Publishing, 2004:3; 3. Sailer, Christian, Wasner, Susanne. Differential Diagnosis Pocket. Hermosa Beach, CA: Borm Bruckmeir Publishing LLC, 2002:7 .
