[Motor control by the basal ganglia].

Area of Science:

• Neuroscience
• Motor Control
• Neurobiology

Context:

• The cerebral cortex governs voluntary movements, while the brainstem and spinal cord manage innate motor patterns like reflexes and locomotion.
• Cortico-reticular pathways from motor areas are crucial for anticipatory postural control before voluntary actions.
• The basal ganglia play a key regulatory role, influencing the cerebral cortex and brainstem-spinal cord via inhibitory and dis-inhibitory mechanisms.

Purpose:

• To propose a mechanism by which basal ganglia dysfunction leads to motor deficits.
• To highlight the role of the dopaminergic projection system in basal ganglia function.
• To explain how impaired regulation results in motor deficiencies observed in basal diseases.

Summary:

• The cerebral cortex controls cognitive and voluntary movement processes.
• The brainstem and spinal cord execute innate motor patterns, with cortico-reticular projections aiding postural control.
• Basal ganglia dysfunction, especially involving dopaminergic abnormalities, may disrupt this cooperative regulation, causing motor deficiencies characteristic of basal diseases.

Impact:

• Provides a framework for understanding the pathophysiology of motor disorders associated with basal ganglia dysfunction.
• Suggests that dopaminergic system abnormalities are key contributors to motor deficits.
• Offers insights into the neural circuitry underlying goal-directed movement and its disruption in disease.