dysmetria
Pronunciation: dis-MET-ree-ah
Impaired ability to judge distance and range of movement, typically indicating cerebellar dysfunction.
Full Definition
Dysmetria is a neurological sign characterized by the inability to control the range of movement in voluntary motor acts. Patients typically overshoot or undershoot their intended target during goal-directed movements. This condition is most commonly associated with cerebellar pathology, particularly lesions affecting the cerebellar hemispheres. Dysmetria is assessed clinically through finger-to-nose and heel-to-shin tests, where patients demonstrate past-pointing or intention tremor. The condition significantly impacts fine motor control and coordination.
Usage
Usage note: Distinguish from dyssynergia, which refers to lack of coordination between muscle groups.
In Context
- "Cerebellar dysmetria was evident during the finger-to-nose test, with consistent overshooting." — Neurological examination findings
- "The patient's dysmetria improved following rehabilitation targeting cerebellar function." — Physical therapy progress note