Fig. 1.

A. Inlet of the cubital tunnel in the diabetic peripheral neuropathy group. The ulnar nerve is depicted by bright arrows. The cross-section of the ulnar nerve is 0.179 mm², the nerve is the circular hypoechoic structure. ME: medial epicondyle. B. Inlet of the cubital tunnel in the diabetes mellitus group; the nerve is the oval hypoechoic structure. ME: medial epicondyle. The cross-section of the ulnar nerve is 0.90 mm². C. Inlet of the cubital tunnel in the control group. The cross-section of the ulnar nerve is 0.87mm²: the nerve is the oval hypoechoic structure