Abstract
Neuronal connections were investigated in the lizard (Ophisaurus apodus) by injecting horseradish peroxidase. Reciprocal connections were found between the septum and the dorsal and mediodorsal cortex, as well as projections from the diagonal bundle nucleus and the anterior dorsolateral and dorsomedial thalamic nuclei to the septum. The most clear-cut bilateral connections were observed between the septum and the preoptic region, the hypothalamic periventricular structures, and the lateral hypothalamic region (containing dopaminergic neurons) as well as nuclei of the mamillary body. Some characteristics and the overall organization pattern of connections between the septum and other limbic system structures are reviewed.
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