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What is the difference between pyramidal and extrapyramidal system?
Wiki User
∙ 13y ago
The Similarity: Pyramidal and extra-pyramidal system are the descending tracts (motor tracts) of spinal cord.
The Difference:
1) Their tracts -
- Pyramidal system = lateral and anterior corticospinal tracts + corticobulbar tract
- Extra-pyramidal system = rubrospinal + olivospinal + lateral and medial reticulospinal + tectospinal + vestibulospinal tracts
2) "Extrapyramidal tracts" don't reach their targets by traveling through the "pyramids of medulla". Pyramidal tracts go through the pyramids of medulla.
3) Pyramidal tracts may directly innervate motor neurons of spinal cord or brainstem (anterior horn cells or certain cranial nerve nuclei). But, extrapyramidal tractsindirectly control the anterior horn cells (for modulation and regulation)
4) Pyramidal system is responsible for fine, isolated, precise and specific movements. Extrapyramidal system is responsible for gross, syngergic movements which require the activity of large groups of muscles
Wiki User
∙ 13y ago
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What does extrapyramidal mean?
relating to or denoting nerves concerned with motor activity that descend from the cortex to the spine and are not part of the pyramidal system.
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Disorders of the pyramidal tracts are characterized by spasticity and paralysis (e.g., stroke). The pyramidal motor system originating in the motor cortex provides control of delicate muscle movement. Tracts of the pyramidal motor system are the corticospinal tract, cortibulbar tract, coricopontine. It is often difficult to delineate a pyramidal from an extrapyramidal lesion during a clinical assessment. Good link for explanation: http://books.google.com/books?id=yY5scDAv8oUC&pg=PA60&lpg=PA60&dq=assess+pyramidal+motor+system+lesion&source=bl&ots=UyFuRjg71r&sig=xj0Gq91LYkRlVCZdra6mH6LTCPo&hl=en&ei=84LyScjSOpOwMfbP_MIP&sa=X&oi=book_result&ct=result&resnum=1#PPA67,M1
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