A 38-Year-Old Woman Is Being Evaluated After Experiencing Intermittent Tingling

A 38-year-old woman is being evaluated after experiencing intermittent tingling and numbness in her left hand for several months. Her symptoms primarily affect the fourth and fifth digits and are frequently triggered by driving a car. A physical examination reveals no anomalies. A nerve stimulator is placed on the left fifth digit and a surface recorder is placed over the ulnar nerve above the elbow during an electrodiagnostic study. An electrical stimulus is applied, and the resulting graph is shown below. The asymptomatic contralateral extremity's results are also shown. Which of the following is most likely to be affected in this patient?

A) Neuronal axons
B) Neuronal cell bodies
C) Postsynaptic membrane
D) Schwann cells
E) Synaptic vesicles

Correct Answer:

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