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Brain: Association fiber | ||
---|---|---|
Diagram showing principal systems of association fibers in the cerebrum. | ||
Dissection of cerebral cortex and brainstem showing association fibers and insular cortex after removal of its superficial grey matter | ||
Latin | Fibrae associationis telencephali | |
Gray's | subject #189 843 | |
Part of | ||
Components | ||
Artery | ||
Vein | ||
BrainInfo/UW | - | |
MeSH | [1] |
Association fibers are bundles of axons within the brain that unite different parts of the same cerebral hemisphere.
In human neuroanatomy, bundles of axons within the brain, called fibers, can be categorized by their function into association fibers, projection fibers, and commissural fibers.
The association fibers unite different parts of the same cerebral hemisphere, and are of two kinds: (1) those connecting adjacent gyri, short association fibers; (2) those passing between more distant parts, long association fibers.
Short association fibers[]
The short association fibers (also often referred to as "U-fibers") lie immediately beneath the gray substance of the cortex of the hemispheres, and connect together adjacent gyri.
Long association fibers[]
The long association fibers include the following:
Name | From | To |
uncinate fasciculus | frontal lobe | temporal lobe |
cingulum | cingulate gyrus | entorhinal cortex |
superior longitudinal fasciculus | frontal lobe | occipital lobe |
inferior longitudinal fasciculus | occipital lobe | temporal lobe |
perpendicular fasciculus | inferior parietal lobule | fusiform gyrus |
occipitofrontal fasciculus | occipital lobe | frontal lobe |
fornix | hippocampus | mammillary bodies |
Arcuate fasciculus | frontal lobe | temporal lobe |
Diffusion tensor imaging is a non-invasive method to study the course of association fibers.
See also[]
- Interneuron
- Tractography
References[]
This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained herein may be outdated. Please edit the article if this is the case, and feel free to remove this notice when it is no longer relevant.
External links[]
- Dictionary at eMedicine Association+fibers
- BrainInfo at the University of Washington ancil-672
- BrainInfo at the University of Washington ancil-673
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