QuestionAugust 13, 2025

18. Symptoms of a disorder includes weak muscles but normal reflexes. Spinal nerves Lower Motor Neurons Interneurons Upper Motor Neurons

18. Symptoms of a disorder includes weak muscles but normal reflexes. Spinal nerves Lower Motor Neurons Interneurons Upper Motor Neurons
18. Symptoms of a disorder includes weak muscles but normal reflexes.
Spinal nerves
Lower Motor Neurons
Interneurons
Upper Motor Neurons

Solution
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Answer

Lower Motor Neurons Explanation 1. Identify the function of each neuron type Spinal nerves and lower motor neurons are involved in muscle control. Interneurons connect neurons within the central nervous system. Upper motor neurons originate in the brain and influence lower motor neurons. 2. Analyze symptoms Weak muscles with normal reflexes suggest an issue with the neurons directly controlling muscles, not those affecting reflex arcs. 3. Determine affected neurons Lower motor neurons directly innervate muscles. Damage here causes weakness but preserves reflexes, unlike upper motor neuron damage which affects reflexes.

Explanation

1. Identify the function of each neuron type<br /> Spinal nerves and lower motor neurons are involved in muscle control. Interneurons connect neurons within the central nervous system. Upper motor neurons originate in the brain and influence lower motor neurons.<br /><br />2. Analyze symptoms<br /> Weak muscles with normal reflexes suggest an issue with the neurons directly controlling muscles, not those affecting reflex arcs.<br /><br />3. Determine affected neurons<br /> Lower motor neurons directly innervate muscles. Damage here causes weakness but preserves reflexes, unlike upper motor neuron damage which affects reflexes.
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