The Anatomical Structure And Location Of The Ulnar Nerve Groove On The Humerus

Description

Running posterior to the medial epicondyle of the humerus, the ulnar nerve courses through the cubital tunnel and tracks along the ulnar nerve groove, a shallow sulcus on the posteromedial distal brachium. The animation situates the groove relative to the medial supracondylar ridge superiorly, the olecranon of the ulna posteriorly at the elbow, and the flexor-pronator origin arising from the medial epicondyle anteriorly. As the viewpoint sweeps around the distal humerus, the sulcus becomes most apparent in posterior and posteromedial perspectives, where the bony contour guides the nerve as it transitions from arm to forearm. A palpable landmark. Compression, traction, or subluxation of the ulnar nerve at this groove underlies common presentations of cubital tunnel syndrome, with paresthesia in the ulnar one and a half digits and potential weakness of intrinsic hand muscles. By showing the nerve’s path dynamically as the elbow moves into flexion, the sequence clarifies why symptoms often worsen with prolonged flexed posture and why a “snapping” ulnar nerve can occur when the retinacular roof over the cubital tunnel is lax. The spatial relationship between bone, nerve, and the medial epicondyle also supports safer surgical planning for ulnar nerve decompression or anterior transposition. Use this animation in upper limb anatomy lectures covering the distal humerus and elbow region, in orthopaedic or hand surgery teaching modules on cubital tunnel release, or in patient-facing education explaining the “funny bone” phenomenon after medial elbow impact. It also fits radiology correlation when introducing MRI or ultrasound landmarks for ulnar nerve evaluation at the medial epicondyle. Anatomical accuracy verified by SciePro's Medical Advisory Board.