10. Phenotypic variability in motor neuron disease: Site of onset and patterns of disease spread

The clinical heterogeneity across motor neuron disease (MND) is well known, and largely attributed to differences in the relative mix of upper (UMN) and lower motor neuron (LMN) dysfunction, site of onset, and rate of disease progression. These differences hold prognostic significance and clues to patterns of disease spread. Objective understanding of motor dysfunction across these clinical phenotypes is thus pivotal for unravelling disease pathogenesis and mechanisms underpinning disease spread.

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