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extrapyramidal system
a functional, rather than anatomical, unit comprising the nuclei and fibers (excluding those of the pyramidal tract) involved
in motor activities; they control and coordinate especially the postural, static, supporting, and locomotor mechanisms. It
includes the corpus striatum, subthalamic nucleus, substantia nigra, and red nucleus, along with their interconnections with
the reticular formation, cerebellum, and cerebrum; some authorities include the cerebellum and vestibular nuclei. Called also
extrapyramidal tract.
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