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the substanita nigha degenartes, dopamine inout decreases, would nroamly be inhibtiory to eknepaholiin patahces in the striatum but sas not dopamine, not inhobiotry to the enkepahlin. so enkaphlin more now and substance p less. so can inhibit the ltaterla pallidum more, so cant sends it inhibotry singal to the subthalamic  nculie, to subthalmac can sends its excitaroy singal to the substantai nighra pars retiuclaris and to the medail pallidum which then caninhibit the thalamus so thalamus cant send its excitoray singal nt the cortey so mocment declines.