Association fiber

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Brain: Association fiber
Gray751.png
Diagram showing principal systems of association fibers in the cerebrum.
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Dissection of cortex and brain-stem showing association fibers and island of Reil after removal of its superficial gray substance.
Latin fibrae associationis telencephali
Gray's subject #189 843
Code TA A14.1.00.016

Functionally, bundles of axons within the brain, called fibers, can be categorized 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.

Contents

[edit] 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.

[edit] 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.

[edit] See also

[edit] External links

This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained within it may be outdated.


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