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• W2023899897 abstract "Quantitative stereological techniques were applied to electron micrographs obtained from frog brain that was stimulated with KCI and then subjected to rapid freeze fixation. Morphometric measurements demonstrated that: (1) no changes occurred in presynaptic structures; (2) the postsynaptic elements (dendritic shafts and dendritic spines) which occupied only 4.8% of the tissue volume in the control experiments, increased in volume to 14.2% of the stimulated tissue without any change in surface area of their boundary membranes; (3) the extracellular space decreased from 19,6% of the tissue volume in the control preparations to 6.7% in the stimulated. A method was developed for correcting the morphometric underestimation of the extracellular space resulting from the partial obscuring of these narrow regions between cells by obliquely cut plasma membranes in sections of finite thickness. The mean width of extracellular spaces was shown to be reduced from 44.3 nm to 18.0 nm after KC1 stimulation. These measurements imply that when stimulated with KC1 the extracellular space of the frog cortex is taken up by the dendritic structures which swell up and change their shape—increasing their volume without a change in their membrane surface area. The role of these changes with respect to the altering synaptic potency and providing a mechanism for neuronal plasticity is discussed." @default.
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• W2023899897 date "1977-01-01" @default.
• W2023899897 modified "2023-09-23" @default.
• W2023899897 title "Quantitative stereological evaluation of KCl-induced ultrastructural changes in frog brain" @default.
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• W2023899897 doi "https://doi.org/10.1016/0306-4522(77)90119-1" @default.
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