 The mediator of the nigro-thalamic connection is, as for the pallido-thalamic the inhibitor GABA.In addition to nigral, VA receives amygdalar and tectal (superior colliculus) axons.The thalamo-cortical axons go to the frontal cortex, the cingulate cortex, the premotor cortex and the oculomotor fields FEF and SEF.