Motor system - Motor system organisation and disorders...

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Motor system: organisation and disorders Lesions Upper Motor Neurone (UMN) Lesions: classified physiologically as Pyramidal or Extrapyramidal Pyramidal lesion involves: o Corticobulbar Tract at any point between its origin in motor cortex & its synapse with an alpha-motorneurone in a brainstem nucleus o Corticospinal (Pyramidal) Tract at any point between its origin in motor cortex & its synapse with an alpha-motorneurone in anterior horn of spinal cord Extrapyramidal lesion involves any of the other descending tracts, i.e. Tectospinal; Rubrospinal; Reticulospinal; Vestibulospinal; Olivospinal: Each type of lesion has its own clinical signs; however, clinically seen as hybrid reflecting balance between tendency of Pyramidal tracts to increase muscle tone & Extrapyramidal tracts to reduce it Other motor disorders are also termed Extrapyramidal, although they don’t directly involve descending tracts, e.g. lesions of the Basal Ganglia Pyramidal signs: o Babinski sign: big toe dorsally flexed & other toes fan outward on scratching sole of foot;
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This note was uploaded on 12/04/2011 for the course ANTHRO 2000 taught by Professor Monicaoyola during the Fall '10 term at Broward College.

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Motor system - Motor system organisation and disorders...

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