Fornix of brain: Information and Much More from Answers.com
- ️Wed Jul 01 2015
| 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 is also the name of part of the
cervix(
fornix vaginae).
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 (where they are also known as the fimbria); 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.
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; then to the anterior nuclei of thalamus which maps to cingulate cortex. The anterior fibers (precommissural fornix) end at the septal nuclei and nucleus accumbens of each half of the brain.
Development
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.
Additional images
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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. |
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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
| Brain: telencephalon (cerebrum, cerebral cortex, cerebral hemispheres) | |
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| Primary sulci/fissures | Medial longitudinal, Lateral, Central, Parietoöccipital, Calcarine, Cingulate, Callosal Collateral fissure |
| Frontal lobe | Precentral gyrus (Primary motor cortex, 4), Precentral sulcus, Superior frontal gyrus/Frontal eye fields (6, 8, 9), Middle frontal gyrus (46), Inferior frontal gyrus (44-Pars opercularis, 45-Pars triangularis), Orbitofrontal cortex (10, 11, 12, 47) |
| Parietal lobe | Somatosensory cortex (Primary (1, 2, 3, 43), Secondary (5)), Precuneus (7m), Parietal lobules (Superior (7l), Inferior (40)), Angular gyrus (39), Intraparietal sulcus, Marginal sulcus |
| Occipital lobe | Primary visual cortex (17), Cuneus, Lingual gyrus, 18, 19 - Lateral occipital sulcus |
| Temporal lobe | Primary auditory cortex (41, 42), Superior temporal gyrus (38, 22), Middle temporal gyrus (21), Inferior temporal gyrus (20), Fusiform gyrus (37) Medial temporal lobe (Amygdala, Hippocampus, Parahippocampal gyrus (27, 28, 34, 35, 36) |
| Cingulate cortex/gyrus | Subgenual area (25), anterior cingulate (24, 32, 33), Posterior cingulate (23, 31), Retrosplenial cortex (26, 29, 30), Supracallosal gyrus |
| white matter tracts | Corpus callosum (Splenium, Genu, Rostrum, Tapetum), Septum pellucidum, Ependyma, Internal capsule, Corona radiata, External capsule, Olfactory tract, Fornix (Commissure of fornix), Anterior commissure, Posterior commissure Terminal stria |
| Basal ganglia | Striatum (Putamen,Caudate nucleus, Nucleus accumbens), Globus pallidus, Claustrum, Subthalamic nucleus, Substantia nigra |
| Other | Insular cortex Olfactory bulb, Anterior olfactory nucleus Septal nuclei Basal optic nucleus of Meynert |
| Some categorizations are approximations, and some Brodmann areas span gyri. |
| White matter fibers |
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| Association fibers
(Uncinate fasciculus, Cingulum,
Superior longitudinal fasciculus/Arcuate fasciculus, Inferior longitudinal
fasciculus, Inferior occipitofrontal fasciculus,
Fornix )
Commissural fibers (Corpus callosum, Anterior commissure, Posterior commissure, Commissure of fornix) Projection fibers |
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