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Motor System and Movement

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Supplementary Motor Area (SMA)

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Initiation of movement, orientation planning, bimanual and sequential movements. Medial aspect of the frontal lobe.

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Primary Motor Cortex

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Execution of voluntary movements. Located in the precentral gyrus of the frontal lobe.

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Upper Motor Neurons

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Neurons that originate in the motor region of the cerebral cortex or brainstem and carry motor information down to lower motor neurons.

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Premotor Cortex

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Planning of movements, control of proximal and trunk muscles. Located anterior to the primary motor cortex.

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Basal Ganglia

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Regulation of movement, control of posture, muscle tone, and motor learning. Comprised of structures such as the caudate nucleus, putamen, and globus pallidus.

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Extrapyramidal Tracts

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Indirect motor pathways that modulate and regulate anterior horn cells. Originates from the brainstem nuclei.

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Rhythmic Movement

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Repetitive patterns of movement such as walking or chewing, involving central pattern generators in the spinal cord.

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Lower Motor Neurons

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Connect the brain and spinal cord to the muscles, directly commanding muscle contraction.

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Cerebellum

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Coordination of voluntary movement, balance, and eye movements. Located in the posterior cranial fossa.

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Reflex Movement

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Automatic, involuntary movement in response to stimuli. Mediated by spinal cord and brainstem.

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Pyramidal Tracts

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Direct pathway for carrying motor signals from the brain to the spinal cord. Descend from the cerebral cortex.

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Voluntary Movement

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Conscious, intentional movement initiated by the cerebral cortex.

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Oculomotor Control

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Control of eye movements. Coordinated by the superior colliculus, frontal eye fields, and cranial nerve nuclei III, IV, and VI.

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Fine Motor Skills

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Small movements involving the coordination of small muscles, such as those of the fingers. Controlled by motor cortex, cerebellum, and basal ganglia.

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Gross Motor Skills

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Larger movements involving the coordination of large muscle groups, such as walking or jumping. Coordinated by the motor cortex and basal ganglia.

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