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Axonal release of serotonin (5-hydroxytryptamine, 5-HT) in the CNS is typically regulated by presynaptic 5-HT autoreceptors. Release of 5-HT in substantia nigra pars reticulata (SNr), a principal output from the basal ganglia, has seemed an interesting exception to this rule. The SNr receives one of the highest densities of 5-HT innervation in mammalian brain and yet negative feedback regulation of...
Basal ganglia are a network of interconnected nuclei, involved in motor control, goal-directed behaviors and procedural learning. Basal ganglia process information from the cerebral cortex through three main pathways. The striatum is the input nucleus of the direct (cortico-striato-nigral) and indirect (cortico-striato-pallido-subthalamo-nigral) pathways while the subthalamic nucleus (STN) is the...
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