In rats, the GABAergic agonist muscimol was injected unilaterally either into the mid ventroposterior striatum (ventral striatum) or into the mid dorsoposterior striatum (dorsal striatum), and the following parameters were estimated: (1) a tonic activity in the electromyogram (EMG) recorded from the gastrocnemius-soleus (GS) muscle, which appears to reflect a muscular rigidity; (2) catalepsy, and (3) asymmetries in posture. Injection of muscimol (25 or 50 ng) into the ventral striatum produced tonic EMG activity, catalepsy and ipsiversive posture; these signs were much less pronounced or not observed after injections into the dorsal striatum. Co-administration of bicuculline (500 ng) into the ventral striatum, or simultaneous injection of muscimol (25 ng) into the substantia nigra pars reticulata (SNR), antagonized both the tonic EMG activity and the catalepsy produced by injection of 50 ng muscimol into the ventral striatum. These results seem to support the assumption that all 3 symptoms mentioned can be produced by an inhibition of striatonigral GABAergic neurones. These symptoms are probably due to a disinhibition of nigrofugal neurones, originating in the SNR.
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