Fig. 3
From: Analysis of the frequency of Martin–Gruber anastomosis in patients with carpal tunnel syndrome
A case of MGA type III, where the electrical stimulation of the median nerve while recording from the APB muscle showed a higher amplitude of the CMAP with proximal stimulation (19.4 mv) than with distal MN stimulation (15.2 mv). To confirm the presence of MGA, electrical stimulation of the ulnar nerve is done at the wrist, at the below-elbow, while recording from the APB muscle