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Synaptic density on the axonal tree of a pyramidal cell in the cortex of the mouse


Schüz,  A
Department Physiology of Cognitive Processes, Max Planck Institute for Biological Cybernetics, Max Planck Society;

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Schüz, A. (1985). Synaptic density on the axonal tree of a pyramidal cell in the cortex of the mouse. Neuroscience, 15(1), 33-39. doi:10.1016/0306-4522(85)90120-4.

The aim of this study was to investigate the density and distribution of synapses on the axonaltree of apyramidalcell in the mousecortex. The method used was a new variation of Golgi-electron microscopy involving the modification of Colonnier, the photochemical method of Blackstad and the use of phosphotungstic acid. A segment of axon collateral of 87 μm carried 17 synapses, the proximal 27 μm being free of synapses. The main axon was postsynaptic down to a length of 30μm. On the following 163 μm there were six presynaptic elements. On the proximal parts of four other collaterals, five synapses were found; a few synapses might, however, have been missed on these ramifications. Most of the synapses were located on thickenings already visible in the light microscope. The synaptic size varied by a factor of 2.7. The results are compared to estimates derived from former statistical investigations with other light and electron microscopical methods.