![]() The gray matter comprises most of the brain’s outer layer and has a high concentration of neuronal cell bodies (contains axons and dendrites) (19). ![]() Specifically, this tract connects the memory and perceptual centers of the brain (18). įinally, the association tracts link the brain’s various regions of the same hemisphere (17). This white matter tract allows the right and left sides of the cerebrum to communicate (16). Ĭrossing over from one cerebral hemisphere to the next through commissures or bridges is the commissural tract (15). ![]() The tract is accountable for delivering information between the cerebrum and the rest of the body (14). The projection tract is vertically located between the lower and higher brain areas and the spinal cord centers (13). These tracts are the commissural tract, association trac t, and the projection trac t (12). There are three bundles of axons or tracts in the white matter that connect the different parts of the brain (11). It facilitates the interhemispheric communication between the left and right cerebral hemispheres (10). Ĭorpus callosum is the most extensive white matter in the brain. It is primarily associated with the cognition and processing of information in the brain (9). Th e white matter is responsible for coordinating communication, modulating action potentials, and relaying information between the brain’s different areas (8). The myelin sheath protects the nerve fibers from injury, enhances the transmission and communication of the electrical nerve signals in the axons, and gives the white matter color (7). In the subcortical part (deeper tissues) of the brain lies the white matter that contains axons or nerve fibers enclosed with myelin (6). Moreover, these tissues have other characteristics and roles in the functioning of the brain. Generally, the brain’s white matter sends information through the nerve fibers (axons) in the brain, while the gray matter process es this information (5). Additionally, the structural MRI shows the information on the anatomical visualization of the brain’s regions and patterns (4). The size, integrity, and shape of these white and gray matters of the brain are quantitatively and qualitatively described in a structural MRI (3). These white and gray matters of the brain are located in the cerebral cortex of the brain’s cerebrum (the largest portion of the brain) that contains millions of glia and neurons (2). Several studies explored different approaches of using magnetic resonance imaging (MRI) in studying the white and gray matter of the brain (1). ![]() MRI of the brain, T1-weighted axial view.ġ, Substantia nigra (Gray matter formation). ![]()
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