Final answer:
Lesions in UMN exhibit strong deep tendon reflexes, pronator drift, positive Babinski sign, spasticity, and the clasp-knife response. LMN lesions show flaccid paralysis, compromised or lost reflexes, fibrillation, and fasciculation.
Step-by-step explanation:
When there is a lesion in the upper motor neurons (UMN), common reflexes include strong deep tendon reflexes, pronator drift, a positive Babinski sign, spasticity, and the clasp-knife response. These reflexes indicate muscle weakness, decreased control of movement, and excess contraction in resistance to stretch. On the other hand, a lesion in the lower motor neurons (LMN) results in flaccid paralysis, compromised or lost reflexes, fibrillation, and fasciculation. In LMN lesions, there is a complete or partial loss of muscle tone and voluntary muscle control.