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lüll Distribution of neurons expressing tyrosine hydroxylase in the human cerebral cortex Benavides-Piccione R; DeFelipe JJ Anat 2007[Aug]; 211 (2): 212-22Since the very first detailed description of the different types of cortical interneurons by Cajal, the tremendous variation in the morphology, physiology and neurochemical properties of these cells has become apparent. However, it still remains unclear whether all types of interneurons are present in all cortical areas and species. Here we have focused on tyrosine hydroxylase (TH)-immunoreactive cortical interneurons, which although only present in certain species, are particularly abundant in the human neocortex. We argue that this type of interneuron is more widespread in the human neocortex than in any other species examined so far and that, therefore, it is probably involved in a larger variety of cortical circuits. In addition, notable regional variation can be seen in relation to these interneurons. These differences further emphasize the variability in the design of microcircuits between cortical areas and species, and they probably reflect an evolutionary adaptation of cortical circuits to particular functions.|Catecholamines/metabolism[MESH]|Cerebral Cortex/*cytology/metabolism[MESH]|Humans[MESH]|Interneurons/cytology/*metabolism[MESH]|Neural Pathways/cytology/metabolism[MESH]|Tyrosine 3-Monooxygenase/*metabolism[MESH] |