which spinal cord tract originates in the primary motor cortex area
A. corticospinal
B. corticobulbar
C. spinocerebellar
D. cuneocerebellar
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define clasp knife phenomenon
A. increase muscle tone with inability to voluntarily control the muscles actively or passively on one side of the joint
B. abnormal decrease in muscle tone caused by damage to motor neurons in ventral horn and spinal nerves in the periphery nerves
C. increased muscle tone results in jerky, alternating resistance to passive movements as muscle contracts or relaxes
D. severe spasticity at joint
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