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Association fiber

Axons that connect cortical areas within the same cerebral hemisphere

Axons that connect cortical areas within the same cerebral hemisphere

FieldValue
NameAssociation fiber
Latinfibrae associationis telencephali
ImageGray751.png
CaptionDiagram showing principal systems of association fibers in the cerebrum.
Image2Gray752.png
Caption2Dissection of cerebral cortex and brainstem showing association fibers and insular cortex after removal of its superficial grey matter

Association fibers are axons (nerve fibers) that connect cortical areas within the same cerebral hemisphere.

In human neuroanatomy, axons within the brain, can be categorized on the basis of their course and connections as association fibers, projection fibers, and commissural fibers. Bundles of fibers are known as nerve tracts, and consist of association tracts, commissural tracts, and projection tracts.

The association fibers unite different parts of the same cerebral hemisphere, and are of two kinds: (1) short association fibers that connect adjacent gyri; (2) long association fibers that make connections between more distant parts.

Short association fibers

Many of the short association fibers (also called arcuate or "U"-fibers) lie in the superficial white matter immediately beneath the gray matter of the cerebral cortex, and connect together adjacent gyri. Some pass from one wall of the sulcus to the other.

Long association fibers

The long association fibers connect the more widely separated gyri and are grouped into bundles. They include the following:

NameFromTo
uncinate fasciculusfrontal lobetemporal lobe
cingulumcingulate gyrusentorhinal cortex
superior longitudinal fasciculusfrontal lobeoccipital lobe
inferior longitudinal fasciculusoccipital lobetemporal lobe
vertical occipital fasciculusinferior parietal lobulefusiform gyrus
occipitofrontal fasciculusoccipital lobefrontal lobe
Arcuate fasciculusfrontal lobetemporal lobe

Diffusion tensor imaging is a non-invasive method to study the course of association fibers.

References

References

  1. Standring, Susan. (2005). "Gray's Anatomy: The Anatomical Basis of Clinical Practice". Churchill Livingstone.
  2. (2019). "Surface-based Tracking of U-fibers in the Superficial White Matter.". Medical Image Computing and Computer-Assisted Intervention.
  3. Standring, Susan. (2005). "Gray's Anatomy: The Anatomical Basis of Clinical Practice". Churchill Livingstone.
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