Pathology of symptomatic tremors

Area of Science:

• Neurology
• Neuroscience

Background:

• Symptomatic tremors present with varied terminology, including rubral, midbrain, thalamic, and cerebellar tremors.
• A common presentation involves delayed-onset postural and action tremors (3 Hz) with proximal distribution, sometimes accompanied by resting tremor and cerebellar dysmetria.

Purpose of the Study:

• To elucidate the neuroanatomical correlates of symptomatic tremors.
• To understand the pathways involved in tremor generation and control.

Main Methods:

• Review of literature identifying tremor types and associated neuropathological findings.
• Analysis of lesion locations and affected neural pathways in symptomatic tremor cases.

Main Results:

• Lesions are predominantly found in the thalamus, brain stem, and cerebellum.
• Degeneration of cerebello-thalamo-cortical and dentato-rubro-olivary pathways is consistently observed.
• Nigrostriatal system dysfunction may contribute to resting tremor components.

Conclusions:

• Symptomatic tremors are linked to specific brain lesions, particularly within the cerebello-thalamo-cortical and dentato-rubro-olivary pathways.
• The precise role of basal ganglia in tremor remains an area for further investigation.