Humerus's Surgical Neck, Posterior View

Description

Humerus surgical neck anatomy is centered in this posterior perspective of the proximal arm bone, highlighting the circumferential constriction just inferior to the greater and lesser tubercles and adjacent to the proximal shaft. Superiorly, the posterolateral aspect of the greater tubercle forms the lateral margin of the frame, while the medial contour transitions toward the humeral head and anatomical neck, which are only partially appreciated from behind. Inferiorly, the shaft broadens and the posterior surface slopes toward the deltoid tuberosity region, reinforcing the proximal to distal change in caliber. Orientation stays anchored to the posterior cortex. No distractions. Fractures through the surgical neck are common after a fall onto the outstretched hand or direct shoulder trauma, and the posterior viewpoint helps you relate the bony narrowing to the pathway of the axillary nerve and posterior circumflex humeral artery as they course around the surgical neck deep to the deltoid. That relationship matters when assessing post-injury deltoid weakness or sensory loss over the lateral shoulder (the regimental badge area), and when planning reduction and fixation where retraction and hardware placement can endanger these structures. The focused lighting and isolated bony surface make the surgical neck easy to distinguish from the more proximal anatomical neck and from tubercular contours that can confuse trainees. Use this illustration in upper limb anatomy teaching to anchor surface and radiographic landmarks of the proximal humerus, and in orthopedics or emergency medicine materials covering proximal humeral fracture patterns, neurovascular exam documentation, and posterior shoulder surgical approaches. It also fits atlases and question banks that test the clinical consequence of surgical neck injuries and the named structures at risk. Anatomical accuracy verified by SciePro's Medical Advisory Board.