QS Study

Intention Tremor

When a person who has lost the cerebellar function performs a voluntary act, the movements tend to oscillate, especially when they approach the intended mark, first overshooting the mark and then vibrating back and forth several times before setting on the mark. This reaction is called intention tremor or an action tremor, and it results from cerebellar overshooting and failure of the cerebellar system damp the motor movement. It is a slow tremor of the extremities that increases on attempted voluntary movement and is observed in certain diseases of the nervous system. Intention tremor may be accompanied by postural tremor and other cerebellar signs:

  • nystagmus
  • dysarthria
  • dysmetria
  • dysdiadochokinesia

They are common among individuals with multiple sclerosis. One common symptom of multiple sclerosis is ataxia, a lack of coordinated muscle movement caused by cerebellar lesions characteristic of multiple sclerosis. The disease often destroys the physical and cognitive function of individuals.

Test for intention tremor: Finger-nose test and Heel-shin test.