fiber tract การใช้

• Its interior axon fiber tracts are called the " arbor vitae ", or Tree of Life.
• This difference in fractional anisotropy is exploited to create a map of the fiber tracts in the brains of the individual.
• Bundles of fiber tracts make the water diffuse asymmetrically in a tensor, the major axis parallel to the direction of the fibers.
• Age-related decline in the commissury fiber tracts that make up the corpus callosum indicate the corpus callosum is involved in memory and executive function.
• As fiber tract connectivity in the corpus callosum declines due to aging, compensatory mechanisms are found in other areas of the corpus callosum and frontal lobe.
• Since cortical neurons and most of their axon fiber tracts don't have to compete for space, cortical structures can scale more easily than nuclear ones.
• Most of the space in the brain is taken up by axons, which are often bundled together in what are called " nerve fiber tracts ".
• While the main caudal source of the fiber tract appears to be posterior superior temporal cortex, the rostral terminations are mostly in premotor cortex, part of Brodmann area 6.
• Fiber tracts of the mammalian central nervous system ( as opposed to the peripheral nervous system ) are incapable of regeneration, and, hence, optic nerve damage produces irreversible blindness.
• In autopsy cases, it has been shown that white matter abnormalities are relatively confined to the cerebrum while avoiding the cerebellum and many of the major fiber tracts of the nervous system.
• The interconnections in the lobes are presumed to enable distinct aspects of memory, whereas the effects of gray matter lesions have been extensively studied, less is known about the interconnecting fiber tracts.
• The "'dorsal longitudinal fasciculus "'( DLF ) ( not to be confused with the medial longitudinal fasciculus, nor the superior longitudinal fasciculus ) is a white matter fiber tract located within the brain stem, specifically in the dorsal brainstem tegmentum.
• Second-order fibers : found in the medulla; decussate in the medulla as internal arcuate fibers and, together with the second-order fibers of the cuneate fasiculus, create nerve fiber tracts called the medial lemniscus, which relays the information received from the first-order neurons to the thalamus.
• Diffusion tensor imaging is an fiber tracts are more likely to be anisotropic, since they are restricted in their movement ( they move more in the dimension parallel to the fiber tract rather than in the two dimensions orthogonal to it ), whereas water molecules dispersed in the rest of the brain have less restricted movement and therefore display more isotropy.
• Diffusion tensor imaging is an fiber tracts are more likely to be anisotropic, since they are restricted in their movement ( they move more in the dimension parallel to the fiber tract rather than in the two dimensions orthogonal to it ), whereas water molecules dispersed in the rest of the brain have less restricted movement and therefore display more isotropy.
• Thanks to the number of different nuclei located within the pontine tegmentum, it is a region associated with a range of functions including sensory and motor functions ( due to the cranial nuclei and fiber tracts ), control of stages of sleep and levels of arousal and vigilance ( due to the ascending cholinergic systems ), and some aspects of respiratory control.
• A variant of diffusion weighted imaging, "'diffusion spectrum imaging "'( DSI ), was used in deriving the Connectome data sets; DSI is a variant of diffusion-weighted imaging that is sensitive to intra-voxel heterogeneities in diffusion directions caused by crossing fiber tracts and thus allows more accurate mapping of axonal trajectories than other diffusion imaging approaches.