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Morphological Alteration in Hippocampus after Status Epilepticus Induced by Intra‐amygdaloid Injection of Dibutyryl‐CAMP in Rats

Granule cell axons or mossy fibers, which normally innervate neurons in the hilus and CA3 field of the hippocampus, are a major excitatory link in the circuitry of the hippocampus.' In the mammalian hippocampal formation, mossy fibers show a normal variation in their distribution and several types of morphological reorganizationq2 Such reorganization includes supragranular sprouting of mossy fibers following partial deafferentation of the dentate gyrus induced by lesions of the perforant path.' Some studies have demonstrated that more extensive supragranular sprouting occurred following a kainic acid treatment.6 An intracerebral or systemic injection of kainic acid caused a selective loss of neurons in the hilus and CA3 and CA4 fields, which presumably produced partial deafferentation of the molecular layer that could serve as a stimulus for mossy fiber sprouting. However, recent studies revealed that mossy fiber sprouting occurred in the absence of overt morphological damage in kindled animals.' These observations have led to the suggestion that epileptic activity could cause structural reorganization of