From there, multiple connections in the basal ganglia project to one another, to the thalamus and, finally, to the cortex, which makes up the extrapyramidal system. This system regulates the initiation and control of Essential Tremor Essential tremor is the most common movement disorder. This postural tremor may have its onset anywhere between the second and sixth decades of life and its prevalence increases with age. It is slowly progressive over a period of years. The specific pathophysiology of essential tremor remains unknown.
Essential tremor occurs sporadically or can be inherited.
While the exact genetic defect has not been identified, familial transmission seems to be autosomal dominant with The frequency of essential tremor is 4 to 11 Hz, depending on which body segment is affected. Proximal segments are affected at lower frequencies, and distal segments are affected at higher frequencies. Although typically a postural tremor, essential tremor may occur at rest in severe and very advanced cases. It most commonly affects the hands but can also affect the head, voice, tongue and legs. The most common type of cerebellar tremor is kinetic, or goal directed.