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Motor recovery mechanisms in patients with middle cerebral artery infarct: a mini-review
1Department of Physical Medicine and Rehabilitation, College of Medicine, Yeungnam University, Taegu, Republic of Korea. strokerehab@hanmail.net
Abstract:
Previous studies on the mechanisms of motor recovery in patients with middle cerebral artery (MCA) infarct except for the studies on cortical peri-infarct reorganization after primary motor cortex infarct were reviewed. Eight studies were classified and reviewed by the following four motor recovery mechanisms: contribution of premotor cortex, subcortical peri-infarct reorganization, ipsilateral motor pathway, and contribution of aberrant motor pathway. MCA infarct is the most common type among the arterial territory infarcts. In addition, MCA territory is important for motor function because it comprises the corticospinal tract, the corticoreticulospinal tract and the neural tracts which are related with apraxia (superior longitudinal fasciculus and corticofugal fibers from the premotor cortex). In spite of the significance of the MCA territory for motor function, fewer studies have reported on the mechanisms of motor recovery in MCA infarct compared to total number of studies about cerebral infarct. In addition, the majority of these studies have focused on the corticospinal tract. Therefore, the total number of studies on this topic should be increased. We believe that further studies comprising other neural tracts except for the corticospinal tract including the extrapyramidal tracts such as the corticoreticulospinal and neural tracts which are related with apraxia, are necessary.
Insights
This review examines motor recovery mechanisms after middle cerebral artery (MCA) infarcts. More research is needed on pathways beyond the corticospinal tract for better understanding and treatment.
Area of Science:
- Neuroscience
- Neurology
- Rehabilitation Medicine
Background:
- Middle cerebral artery (MCA) infarcts are common and significantly impact motor function due to critical neural tracts within their territory.
- Existing research on motor recovery mechanisms after MCA infarcts is limited, particularly compared to broader cerebral infarct studies.
- Most studies have concentrated on the corticospinal tract, neglecting other crucial pathways involved in motor control and recovery.
Purpose of the Study:
- To review and classify existing studies on motor recovery mechanisms following MCA infarcts.
- To identify gaps in the current research landscape regarding the neural pathways involved in motor recovery.
- To emphasize the need for expanded research beyond the corticospinal tract.
Main Methods:
- Systematic review and classification of eight previous studies.
- Categorization of motor recovery mechanisms into four key areas: premotor cortex contribution, subcortical peri-infarct reorganization, ipsilateral motor pathway, and aberrant motor pathway.
- Analysis focused on neural tracts affected by MCA infarcts, including corticospinal, corticoreticulospinal, and tracts related to apraxia.
Main Results:
- Identified four primary mechanisms contributing to motor recovery after MCA infarcts.
- Highlighted the limited scope of current research, predominantly focusing on the corticospinal tract.
- Demonstrated the importance of the MCA territory for motor function, encompassing multiple critical neural pathways.
Conclusions:
- Further investigation into motor recovery mechanisms following MCA infarcts is essential.
- Research should expand to include extrapyramidal tracts, such as the corticoreticulospinal tract, and pathways involved in apraxia.
- Increased study numbers and broader pathway analysis are necessary for a comprehensive understanding of motor recovery.
