Abstract
Stereotactic injection of acetylcholine (0.5–2 μg) into the lateral septal region of the rat brain produces a long-lasting sympathetic-mediated increase of the arterial blood pressure. This effect is mediated by muscarinic receptors since 1 μg atropine abolishes this response. In this same brain region, TRH (0.5–4 μg) did not elicit any significant change in the arterial blood pressure, but potentiated the effect of acetylcholine. This phenomenon is apparently due to an increase of the number of muscarinic receptors in the lateral septal area of the rat brain.
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