The Similarity: Pyramidal and extra-pyramidal system are the descending tracts (motor tracts) of spinal cord.
The Difference:
1) Their 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
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.
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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lollssxx
· Increased tone in anti-gravity muscles · No muscle wasting · Paralysis of voluntary movements · Absent abdominal reflex · Babinski's Sign - plantar reflex · Deep tendon reflexes brisk, exaggerated/sustained clonus
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there is a huge difference. :)