What are subcortical U Fibres?
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 are U-fibers?
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 is periventricular white matter?
Periventricular white matter is composed of bundles of myelinated nerve fibers (axons). These bundles appear “white” due to the heavy myelination of these fast-conducting fiber tracts, which convey motor and sensory information to their targets within the spinal cord and cerebrum, respectively.
What is leukodystrophy?
Leukodystrophies are a group of rare, genetic disorders that affect the white matter of the brain. The word leukodystrophy comes from leuko, which means white, and dystrophy, which means imperfect growth. Leukodystrophies are characterized by this abnormal growth of white matter in the brain.
What is nonspecific white matter hyperintensities?
White matter hyperintensities (WMH) is a non-specific term that refers to white matter (WM) signal hyperintensity areas on T2 weighted MRI scans, and correlates with WM rarefaction (leucoaraiosis) as defined on CT scans. The main risk factors associated with development of WMH are older age and blood hypertension.
What does subcortical white matter mean?
White matter is found in the deeper tissues of the brain (subcortical). It contains nerve fibers (axons), which are extensions of nerve cells (neurons). Many of these nerve fibers are surrounded by a type of sheath or covering called myelin.
Is corona radiata subcortical?
Evidence from subcortical small infarcts suggests that motor fibers are somatotopically arranged in the human corona radiata.
Is corona radiata a lacunar stroke?
Lacunar strokes present with classic syndromes. The most common, seen in 50–66% of strokes, is pure motor hemiparesis involving the face, arm, and leg. In this syndrome, the stroke may be located in the corona radiata, posterior limb of the internal capsule, pons, or in the medullary pyramids.
Is subcortical white matter normal?
Subcortical white matter builds neural connections between cortical and subcortical regions and constitutes the basis of neural networks. It plays a very important role in normal brain function. Various studies have shown that white matter deteriorates with aging.
What is subcortical white matter?
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.
Are there any illustrations of subcortical and juxtacortical lesions?
Illustrations depicting the course of subcortical u-fibers and the relative positions for juxtacortical and subcortical lesions. These illustrations are based on the diagrams from “Sobotta’s Textbook and Atlas of Human Anatomy 1908”, the copyright of which has lapsed.
What are U-fibers in the brain?
U-fibers represent connections between neighboring areas and are located in the white matter immediately deep to the cerebral cortex. Using gyrencephalic carn … In the white matter of the human cerebrum, the majority of cortico-cortical fibers are of short range, connecting neighboring cortical areas.