Ataxia-cerebellum function/ .s Ataxia is the shaky and unsteady movements that result from brain's failure to regulate posture, strend and direction of movements, most often caused by disease activity il cerebellumAtaxia – cerebellum function ❖ Ataxia is the shaky and unsteady movements that result from brain's failure to regulate posture, strength and direction of movements, most often caused by disease activity in cerebellum