extrapyramidal disease

(redirected from extrapyramidal motor system disease)

extrapyramidal

 [eks″trah-pĭ-ram´ĭ-d'l]
outside the pyramidal tracts.
extrapyramidal disease (extrapyramidal syndrome) any of a group of clinical disorders marked by abnormal involuntary movements, alterations in muscle tone, and postural disturbances; the group includes parkinsonism, chorea, athetosis, and others.
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.

ex·tra·py·ram·i·dal dis·ease

a general term for a number of disorders caused by abnormalities of the basal ganglia or certain brainstem or thalamic nuclei; characterized by motor deficits, loss of postural reflexes, bradykinesia, tremor, rigidity, and various involuntary movements.

extrapyramidal disease

any of a large group of conditions affecting the extrapyramidal tracts and characterized by involuntary movement, changes in muscle tone, and abnormal posture. Examples include tardive dyskinesia, chorea, athetosis, and Parkinson's disease.

extrapyramidal disease

Neurology Any condition affecting the basal ganglia and their interconnections; EDs include Huntington's disease, Parkinson's disease, Tourette syndrome, Wilson's disease, dystonias, hemiballism, myoclonias, tardive dyskinesia, tremors

ex·tra·py·ram·i·dal dis·ease

(eks'tră-pir-am'i-dăl di-zēz')
A general term for a number of disorders caused by abnormalities of the basal ganglia or some brainstem or thalamic nuclei; characterized by motor deficits, loss of postural reflexes, bradykinesia, tremor, rigidity, and various involuntary movements.

ex·tra·py·ram·i·dal dis·ease

(eks'tră-pir-am'i-dăl di-zēz')
General term for various disorders caused by abnormalities of the basal ganglia or certain brainstem or thalamic nuclei.
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