Fig. 3.

US shows the path of the ulnar nerve (black arrow) at the posteromedial aspect of the joint, both in longitudinal (a) and axial scans (b, c): the ulnar nerve crosses the elbow region inside the cubital tunnel (arrow heads) (a, b). Axial images are best for assessing the location of the nerve inside the tunnel (b). More distal sonograms depict it running between the humeral and ulnar heads of the flexor carpi ulnaris muscle (stars) (c). Longitudinal US images show the typical fascicular appearance of the nerve.