Document Detail

Motor consequences of motor area ablations in man.
MedLine Citation:
PMID:  833609     Owner:  NLM     Status:  MEDLINE    
Motor disorders reported in the present paper do not result from cortical ablations stricto sensu since some white matter was excised in every patient. However they appear to suggest that, as suggested by Walshe (1935), the central region and premotor area are a functional entity, i.e. they work as a whole. The extensive lesions of the premotor area, leaving untouched the motor region, have the same motor and tonic consequences as lesions limited to the central region. This point which appears specific for man does not imply that the premotor region subserves activities similar to those subserved by the central region. Rather it may suggest a deafferentiation of the central region, the consequences of which would be more important than is generally assumed. Extensive central or premotor lesions determine various tonic disorders: a well known spasticity, with exaggeration of the stretch reflex, associated with an increase in passive swinging of segments of limbs and in extensibility of joints. These two latter phenomena are usually defined as hypotonia. With premotor and precentral lesions the hypotonia disappears and a hemiplegic posture is observed. This hemiplegic posture is a dystonia which apparently does not result directly from the exaggeration of the stretch reflex. Anatomically it appears to result from lesions of both central and premotor regions. This is in agreement with Denny-Brown's (1966) contention that an extrapyramidal region lies rostral to the prerolandic sulcus. As suggested by Evarts (1973) motor regions appear to control automatic as well as voluntary movements. They probably play a role in the trophic function of muscle, since, despite rehabilitation, amyotrophy was present in every case reported in the present paper.
D Laplane; J Talairach; V Meininger; J Bancaud; A Bouchareine
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Publication Detail:
Type:  Case Reports; Journal Article    
Journal Detail:
Title:  Journal of the neurological sciences     Volume:  31     ISSN:  0022-510X     ISO Abbreviation:  J. Neurol. Sci.     Publication Date:    1977 Jan-Feb
Date Detail:
Created Date:  1977-03-31     Completed Date:  1977-03-31     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  0375403     Medline TA:  J Neurol Sci     Country:  NETHERLANDS    
Other Details:
Languages:  eng     Pagination:  29-49     Citation Subset:  IM    
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MeSH Terms
Epilepsy / surgery*
Motor Activity*
Motor Cortex / physiology,  surgery*
Muscle Tonus
Muscles / physiology

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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