Table 2.

Phenotypes in cerebellar tremors.

Type of cerebellar tremor	Phenomenology	Responsible region
Kinetic tremor in Holmes' classic study	• Irregular and discontinuous sways • Sometimes marked at the beginning of the movement	The cerebellum (probably destruction of the cerebellar cortex and/or the white matter)
Static tremor in Holmes' classic study	• Subtype 1: Irregular oscillation in the extension of upper limbs during the maintenance of the limb against gravity • Subtype II: Regular oscillations of a limb or some of its segments during maintenance of the limb accurately in certain positions	The cerebellum (probably destruction of the cerebellar cortex and/or the white matter)
Intention tremor	• Amplitude increase during visually guided movements toward a target at the movement termination	The dentato-rubro-thalamic tract
“Holmes' tremor”	• Concomitant expression of rest tremor* and intention tremor with/without postural tremor* • Slow frequency, usually <4.5 Hz • Late onset of pathologies	Superior peduncle, midbrain tegmentum, and posterior thalamus
Palatal tremor	• Rhythmic movements of the soft palate • Late onset of pathologies	The brainstem and the cerebellum
Essential tremor	• Bilateral, largely symmetric postural tremor or kinetic tremor* • Involving hands and forearm, with or without head tremor and tremor in other locations	Cerebellar cortex

Kinetic tremor, tremor occurring during any voluntary movement; postural tremor, tremor present while voluntarily maintaining a position against gravity; rest tremor, tremor that occurs in a body part that is not voluntarily activated and is completely supported against gravity.

^*Definition by Consensus Statement of the Movement Disorder Society on Tremor (11).