NCAM1 and Dysphagia: Compared with controls, PD patients had: Increased variability in fibre size, increased % fibres with central nuclei, more angular small fibres, fibre atrophy and fibre type grouping (greater atrophy in patients with dysphagia), fast‐to‐slow shift in fibre types, more N‐CAM‐positive fibres indicating denervation.