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عمومی::
مادهی سفید، مادهی سفید
The spinal cord, as seen in cross section (Fig. 14), contains central grey matter and peripheral white matter.
The white matter contains ascending and descending fiber pathways.
However, it is vital to remember the sites of contralateral crossing over of the various pathways and also the location of the pathways within the white matter as seen in cross section (Fig. 14).
The lesion involves the posterior columns of white matter (Fig. 18B) and may extend to the posterior roots and root ganglia.
In both spinal cord and brain stem the grey matter (nuclei) lies close to the central canal and the white matter (long fiber tracts) farther away.،Two infant magnetic resonance imaging (MRI) studies documented changes in gray matter (GM) and white matter (WM) tissue properties in prenatally SSRI-exposed infants (eg, altered fractional anisotropy of the thalamostriatal GM and
superior WM fascicule and increased mean diffusivity in several major fasciculi).
Based on prior animal studies, we hypothesized that prenatally SSRI-exposed infants would demonstrate altered GM morphology and WM connectivity within the corticolimbic circuit.
To test this, we used deformation-based GM morphometry and diffusion probabilistic WM tractography.
In this cohort study including 98 infants, significant gray matter volume expansion was noted in the amygdala and insula, as well as an increase in white matter structural connectivity between these same regions in selective serotonin reuptake inhibitor- exposed infants, compared with infants exposed to untreated prenatal maternal depression and healthy controls.
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2
روان شناسی و مشاوره::
ماده سفید
No clots, no tumors, just beautiful juicy gray and white matter that filled the skull.
In one experiment, they found that eleven days of training in mindful breathing increased participants' white matter connections emanating from their brain's anterior cingulate
But the admitting clerk saw what looked like toothpaste - actually, it was the white matter of his frontal lobe - oozing from a hole the size of a dime high up on his forehead.
His soft gray and white matter offered no resistance as it tumbled, undeterred, and lodged into the bone encasing his brain, about four inches above the top of his neck.
After the occipital and temporal lobes were removed, it was time to go deeper, to suction out the white matter, the right hippocampus, the right amygdala, the right thalamus and hypothalamus - right down to the brain stem, the basement, where I stopped.
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