Abstract

Methods of light and electron microscopy were used to compare dendritic spines of cortical neurons in three principal areas (dorsal, medial, and lateral cortex) of the forebrain inTestudo horsfieldi andEmys orbicularis. Differences between the spines in each of the three areas were found to be common to both species. Differences in the distribution of dendrites in proximal, middle, and distal segments of the dendrites and the density, shape, length, and fine structure of these formations were all taken into account. Besides the undoubted similarity between the species, differences were found in the fine structure of the spines and in their quantitative distribution in homonymous cortical zones and are connected with the character of processing of incoming information, which is largely dependent on the ecological features of the species.

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