What are U-fibers brain?

U-fibers, which serve as short-range association fibers, represent connections between neighboring areas of the cerebral cortex and are located in the white matter immediately deep to the cerebral cortex [1–5]. U-fibers are thought to mediate important higher-order cognitive functions of the nervous system [3, 5].

What are the two types of association fibers?

Association fibers of the brain, also known as association tracts of the brain or intrahemispheric tracts (cortex-cortex connections 1) are a type of white matter tract that connects different areas in the same hemisphere. There are two types of association fibers: long-range and U-fibers (short-range) 1.

What are the three types of fiber tracts?

There are three main types of white matter nerve fiber tracts: commissural fibers, association fibers, and projection fibers. Commissural fibers connect corresponding regions of the left and right hemispheres of the brain.

Is the Cingulum Association Fibres?

Distant regions of the cortex are connected by long association fibers; these include the cingulum adjacent to the cingulate gyrus. A tract that forms frontotemporal connections is referred to as the inferior longitudinal fasciculus. The superior longitudinal fasciculus connects frontal parietal and occipital cortices.

What are short association fibers?

Short association fibers (U-fibers) connect proximal cortical areas and constitute the majority of white matter connections in the human brain.

What does Juxtacortical mean?

Medical Definition of juxtacortical : situated or occurring near the cortex of an organ or tissue.

What type of fibers connects cortex with subcortical structures?

The three most commonly recognized types of fibers within the white matter are projection, commissural, and association fibers. They connect cortex and subcortical nuclei, interconnect the centers of the two hemispheres, and connect cortical areas of the same hemisphere, respectively.

What are subcortical U-fibers?

Subcortical U-fibers, also known as short association fibers, represent connections between adjacent gyri of the brain, located within the cortex or immediately deep to it in the very outer parts of the subcortical white matter 1.

What is commissural fibers?

Commissural fibers connect an area in one hemisphere with an area in the opposite hemisphere. The corpus callosum is the largest set of commissural fibers in the brain and is a pathway of crucial importance to speech-language functions (Fig. 2-10, B).

What does the cingulum bundle do?

The cingulum bundle (CB) is a critical white matter fiber tract in the brain, which forms connections between the frontal lobe, parietal lobe and temporal lobe. In non-human primates, the CB is actually divided into distinct subcomponents on the basis of corticocortical connections.

What is the difference between association and commissural fibers?

Association fibers connect the various cortical regions within each hemisphere, commissural fibers connect the corresponding regions of the two hemispheres, and projection fibers connect the cortex and lower parts of the brain.