96. Motor functions of the cerebral cortex, basal ganglia, and cerebellum
Covers the motor roles of the premotor cortex, supplementary motor area and primary motor cortex, then the direct and indirect basal ganglia pathways with their neurotransmitters and dopamine's modulating role. It closes with the cerebellum's three divisions, the layers of its cortex, and its climbing and mossy fibres, with a set of recap questions at the end.
Topic 95 of 104 in the MU Sofia syllabus for Physiology (Dental Medicine, Year 2). The free AceMed note covers it in 6 sections, about 762 words (6 min of reading), with 27 flashcards.
In this note
Motor Functions of the Cerebral Cortex, Basal Ganglia, and Cerebellum
Cerebral Cortex: The "Executive" for Voluntary Movement
Basal Ganglia: "Refinement" and Movement Selection
Cerebellum: "Coordination" and Error Correction
Layers of the Cerebellum:
Recap Questions
Motor Functions of the Cerebral Cortex, Basal Ganglia, and Cerebellum
The cerebral cortex, basal ganglia, and cerebellum are key components of the brain involved in planning, coordinating, and executing movements. They work together in a complex interplay to produce smooth, purposeful, and adaptable motor behaviors.
Cerebral Cortex: The "Executive" for Voluntary Movement
The cerebral cortex is the outermost layer of the brain responsible for higher-level cognitive functions, including voluntary movement via descending pathways.Specific areas within the cortex are dedicated to motor control:
Premotor Cortex and Supplementary Motor Area (SMA): Located anterior to the primary motor cortex. These areas are involved in planning and sequencing movements, as well as mental rehearsal of actions. They receive input from associative areas and project to the primary motor cortex.
Primary Motor Cortex (M1):It is Brodmann’s area 4. Situated in the precentral gyrus. Responsible for executing voluntary movements by sending commands to lower motor neurons in the spinal cord and brainstem. Organized somatotopically, with different regions controlling specific body parts. This organization is reflected in the motor homunculus.
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