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Review Article
The Supplementary Motor Complex in Parkinson’s Disease
Shervin Rahimpour, Shashank Rajkumar, Mark Hallett
J Mov Disord. 2022;15(1):21-32.   Published online November 25, 2021
DOI: https://doi.org/10.14802/jmd.21075
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  • 3 Citations
AbstractAbstract PDF
Parkinson’s disease (PD) is a neurodegenerative disorder characterized by both motor and nonmotor symptoms. Although the basal ganglia is traditionally the primary brain region implicated in this disease process, this limited view ignores the roles of the cortex and cerebellum that are networked with the basal ganglia to support motor and cognitive functions. In particular, recent research has highlighted dysfunction in the supplementary motor complex (SMC) in patients with PD. Using the PubMed and Google Scholar search engines, we identified research articles using keywords pertaining to the involvement of the SMC in action sequencing impairments, temporal processing disturbances, and gait impairment in patients with PD. A review of abstracts and full-text articles was used to identify relevant articles. In this review of 63 articles, we focus on the role of the SMC in PD, highlighting anatomical and functional data to create new perspectives in understanding clinical symptoms and, potentially, new therapeutic targets. The SMC has a nuanced role in the pathophysiology of PD, with both hypo- and hyperactivation associated with various symptoms. Further studies using more standardized patient populations and functional tasks are needed to more clearly elucidate the role of this region in the pathophysiology and treatment of PD.

Citations

Citations to this article as recorded by  
  • Sensorimotor network connectivity correlates with motor improvement after repetitive transcranial magnetic stimulation in patients with Parkinson's disease
    Shumei Chi, Xinrui Wen, Yang Yu, Guanjun Wang, Jie Zhang, Chuang Xue, Xiaoying Zhang, Zheng Wang, Meiduo Gesang, Jiefang Chen, Sha Wu, Man Jin, Jian Liu, Benyan Luo
    Parkinsonism & Related Disorders.2023; 106: 105218.     CrossRef
  • A new model for freedom of movement using connectomic analysis
    Diego Alonzo Rodríguez-Méndez, Daniel San-Juan, Mark Hallett, Chris G. Antonopoulos, Erick López-Reynoso, Ricardo Lara-Ramírez
    PeerJ.2022; 10: e13602.     CrossRef
  • Cortical and subcortical morphological alterations in motor subtypes of Parkinson’s disease
    Jianyu Li, Yuanchao Zhang, Zitong Huang, Yihan Jiang, Zhanbing Ren, Daihong Liu, Jiuquan Zhang, Roberta La Piana, Yifan Chen
    npj Parkinson's Disease.2022;[Epub]     CrossRef

JMD : Journal of Movement Disorders