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White matter is the tissue through which messages pass between different areas of grey matter within the central nervous system. The white matter is white because of the fatty substance (myelin) that surrounds the nerve fibers (axons). This myelin is found in almost all long nerve fibers, and acts as an electrical insulation.
The white matter is substantially affected, with noticeable atrophy (tissue loss), in addition to calcification of the arteries. [2] [6] [17] Microinfarcts may also be present in the gray matter (cerebral cortex), sometimes in large numbers. [2]
Grey matter in the spinal cord is known as the grey column which travels down the spinal cord distributed in three grey columns that are presented in an "H" shape. The forward-facing column is the anterior grey column , the rear-facing one is the posterior grey column and the interlinking one is the lateral grey column .
Researchers analyzing the white matter of superagers over a 5-year period found that despite comparable overall white matter health with typical older adults, superagers exhibited superior ...
Age-related decrease in gray matter volume was the largest contribution to changes in brain volume. Moreover, neuronal density appears to decrease, white matter microstructure gets altered and energy metabolism in the cerebellum gets altered. [16] General cortical atrophy occurs in aging and e.g. the caudate nucleus volume appears to decrease.
Periaqueductal gray; Rostral interstitial nucleus of medial longitudinal fasciculus; Midbrain reticular formation; Dorsal raphe nucleus; Red nucleus; Ventral tegmental area. Parabrachial pigmented nucleus; Paranigral nucleus; Rostromedial tegmental nucleus; Caudal linear nucleus; Rostral linear nucleus of the raphe; Interfascicular nucleus ...
In aging, degradation of white matter structure has emerged as an important general factor, further focusing attention on the critical white matter connections. [citation needed] Exercise affects many people young and old. [14] For the young, if exercise is introduced it can form a constructive habit that can be instilled throughout adulthood.
But when should memory problems prompt a person to be screened for dementia? Biden and Trump's age and fitness for the presidency at 81 and 77 years old respectively is a top-of-mind issue for voters.
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