How to perform Cerebellar Tests - Dysmetria, Dyssynergia, Dysdiadochokinesia

By: Dr Timothy Conwell

Dysmetria which is past pointing. Have the patient's put their feet together. And reach out with their hands and do as I do. Finger to nose, please. And back out. Finger to nose and back out. Now close your eyes and do it again.

Finger to nose. This is dysmetria for past pointing. Do this one please. Now open up and touch your finger to my finger, and back. Now your finger to my finger and to your nose.

Now back to my finger and back. Now do it with this side, finger to finger, to nose, to finger, to back. That's dysmetria for past pointing. Now put your hands out like so. And I want you to tap me quickly like so. Real quick, real quick.

This is dyssynergia for rapid, repetitive movements. A patient with a lesion of the cerebellum will be discoordinated and won't be able to tap equally. So tap for me real quick.

How to perform Cerebellar Tests - Dysmetria, Dyssynergia, Dysdiadochokinesia

See how Smooth the rhythmic that is. That's dyssynergia. This is rapid, alternating movements or dysdiadochokinesia. A person that had a cerebellar lesion will not be able to do it smoothly and uniformly.

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