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In anatomy, the extrapyramidal system is a part of the motor system network causing involuntary actions. [1] The system is called extrapyramidal to distinguish it from the tracts of the motor cortex that reach their targets by traveling through the pyramids of the medulla .
Central structures include cerebral cortex, brainstem, spinal cord, pyramidal system including the upper motor neurons, extrapyramidal system, cerebellum, and the lower motor neurons in the brainstem and the spinal cord. [3] The motor system is a biological system with close ties to the muscular system and the circulatory system.
Extrapyramidal symptoms (also called extrapyramidal side effects) get their name because they are symptoms of disorders in the extrapyramidal system, which regulates posture and skeletal muscle tone. This is in contrast to symptoms originating from the pyramidal tracts. [citation needed]
The vestibulospinal tract is a nerve tract in the central nervous system. Specifically, it is a component of the extrapyramidal system and is classified as a component of the medial pathway. Like other descending motor pathways, the vestibulospinal fibers of the tract relay information from nuclei to motor neurons. [1]
The red nucleus or nucleus ruber is a structure in the rostral midbrain involved in motor ... nigra are subcortical centers of the extrapyramidal motor system.
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It is part of the telencephalon, but retains close functional ties with the subthalamus in the diencephalon – both of which are part of the extrapyramidal motor system. [2] The globus pallidus receives principal inputs from the striatum, and principal direct outputs to the thalamus and the substantia nigra.
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