Question

Lower motoneuron lesions may cause decreased tone, DTRs, and toes. What is the effect of lower motoneuron lesions on tone, DTRs, and toes?

1) Decreased tone, decreased DTRs, and decreased toe movement
2) Increased tone, increased DTRs, and increased toe movement
3) Decreased tone, increased DTRs, and increased toe movement
4) Increased tone, decreased DTRs, and decreased toe movement

Answer 1

Lower motoneuron lesions lead to decreased muscle tone, decreased deep tendon reflexes, and decreased toe movement, which is indicative of flaccid paralysis and the denervation of muscle fibers.

Step-by-step explanation:

The effect of lower motoneuron (LMN) lesions on tone, deep tendon reflexes (DTRs), and toe movement is decreased tone, decreased DTRs, and decreased toe movement. A lesion on the LMN can lead to flaccid paralysis, which indicates a complete or partial loss of muscle tone.

Other signs of an LMN lesion include fibrillation, fasciculation, and compromised or lost reflexes due to the denervation of the muscle fibers. This contrasts with upper motoneuron (UMN) lesions, which typically result in retained muscle tone and spasticity.