Question

Of the following, which is NOT a symptom of lower motor neuron syndrome?

A. Paresis
B. Areflexia
C. Paralysis
D. Decreased tone
E. All of the above are symptoms of lower MNS

Answer 1

All the options listed (paresis, areflexia, paralysis, and decreased tone) are indeed symptoms of lower motor neuron syndrome. In contrast, upper motor neuron lesions present with retained muscle tone and spasticity.

Step-by-step explanation:

Of the following options, which is NOT a symptom of lower motor neuron syndrome (MNS)? The answer is E. All of the above are symptoms of lower MNS. Symptoms of lower motor neuron syndrome include paresis (partial loss of voluntary muscle control), areflexia (loss or reduction of reflexes), paralysis (complete loss of muscle function), and decreased tone (flaccid muscles). These symptoms arise because lesions on the lower motor neurons (LMN) result in flaccid paralysis, fasciculation, and compromised reflexes due to denervation of muscle fibers. In contrast, upper motor neuron (UMN) lesions are characterized by retained muscle tone, spasticity, and a different set of symptoms including hyperflexia and the clasp-knife response.