<prompt> Following are the features of corticospinal involvement exceptCog-wheel rigiditySpasticityPlantar extensor responseExaggerated deep tendon reflexes  <response>: Babinski sign is the sure sign of pyramidal tractcorticospinal lesion.Spasticity and exaggerated tendon reflexes are due to extrapyramidal lesions. Since pyramidal lesion occurring alone is rare, extrapyramidal lesions also may be seen. Rigidity seen is clasp knife type. 