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Motor System and Movement
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Primary Motor Cortex
Execution of voluntary movements. Located in the precentral gyrus of the frontal lobe.
Premotor Cortex
Planning of movements, control of proximal and trunk muscles. Located anterior to the primary motor cortex.
Supplementary Motor Area (SMA)
Initiation of movement, orientation planning, bimanual and sequential movements. Medial aspect of the frontal lobe.
Basal Ganglia
Regulation of movement, control of posture, muscle tone, and motor learning. Comprised of structures such as the caudate nucleus, putamen, and globus pallidus.
Cerebellum
Coordination of voluntary movement, balance, and eye movements. Located in the posterior cranial fossa.
Pyramidal Tracts
Direct pathway for carrying motor signals from the brain to the spinal cord. Descend from the cerebral cortex.
Extrapyramidal Tracts
Indirect motor pathways that modulate and regulate anterior horn cells. Originates from the brainstem nuclei.
Upper Motor Neurons
Neurons that originate in the motor region of the cerebral cortex or brainstem and carry motor information down to lower motor neurons.
Lower Motor Neurons
Connect the brain and spinal cord to the muscles, directly commanding muscle contraction.
Reflex Movement
Automatic, involuntary movement in response to stimuli. Mediated by spinal cord and brainstem.
Voluntary Movement
Conscious, intentional movement initiated by the cerebral cortex.
Rhythmic Movement
Repetitive patterns of movement such as walking or chewing, involving central pattern generators in the spinal cord.
Fine Motor Skills
Small movements involving the coordination of small muscles, such as those of the fingers. Controlled by motor cortex, cerebellum, and basal ganglia.
Gross Motor Skills
Larger movements involving the coordination of large muscle groups, such as walking or jumping. Coordinated by the motor cortex and basal ganglia.
Oculomotor Control
Control of eye movements. Coordinated by the superior colliculus, frontal eye fields, and cranial nerve nuclei III, IV, and VI.
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