Developing nonpyramidal neurons from P0 and P5 display growth cones, filopodia, preterminal growth buds, and irregular varicose swellings along the dendrites. Electron microscopy of identified nonpyramidal neurons revealed small infoldings of the nuclear membrane and immature synapses on the short dendritic shafts of these cells. Great variability of the shape of the cell body and of the orientation of dendrites was observed when compared with the more stereotyped pyramidal neurons. On the day of birth nonpyramidal neurons display relatively large cell bodies with short, clumsy dendrites. The results can be summarized as follows: 1. We analyzed the postnatal stages P0 (day of birth), P5, P10 and P20. Representative neurons were gold-toned and processed for an electron microscopic study of identified cells. This study describes the morphological differentiation of nonpyramidal neurons in areas CA1 and CA3 of the rat hippocampus as seen after Golgi-impregnation.
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