Stimulation-induced changes in dimensions of stalks of dendritic spines in the dentate molecular layer

Abstract Tetanic stimulation of the lateral and medial segments of the entorhinal area induces an increase in the width of the spine head and spine stalk in the middle and distal thirds of the dentate molecular layer 4 min after stimulation. Ninety minutes after stimulation, both spine stalk and head were wider in the distal third, whereas, in the middle third, the stalk returned to control values. Whereas the length of the spine head did not change systematically with stimulation, the length of the spine stalk was systematically reduced in the distal third in both poststimulation intervals.

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