**2. Aim of the article**

The major goal of this article is to search, discuss and review the nongenomic rapid actions of THs in mature mammalian CNS. This article aims to begin with observations describing subcellular distribution, and concentrations of THs within the brain and its biochemical and physiologic consequences, specific binding of THs onto the neuronal plasma membrane to examine for specific plasma membrane receptors of THs and correlate the receptor-binding followed by a specific cellular function. Next, the molecular basis of the TH and plasma membrane receptor interaction-mediated signals are evaluated via possible activation of Gprotein signaling pathway, second messenger systems, and subsequent target protein phosphorylation.
