Abstract
A morphometric electron microscope study was carried out on the ultrastructure of 140 presynaptic terminals (PT) in the dorsal horn of the cat spinal cord. Some spatial characteristics of mitochondria and active zones (AZ) for these PT were examined using statistical stereological analysis techniques. The distribution of 3-dimensional mitochondrial radii was determined, together with average mitochondrial volume, mean area of the external membrane, and average numbers of the test population falling within the PT. Distribution of diameters and estimates of mean area of AZ were obtained, as well as of mean value of synaptic clefts. The relationship between findings from morphometric research and parameters of processes underlying ionic transmembrane diffusion and accumulation is discussed.
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