Surgical Neck Of The Humerus, Posterior View

Description

Surgical neck of the humerus sits immediately distal to the greater and lesser tubercles, forming the narrowed metaphyseal region where the proximal humerus transitions into the cylindrical shaft. From a posterior perspective, the humeral head and articular surface are largely obscured, while the posterior aspect of the proximal shaft and the lateral prominence of the greater tubercle define the superior contour. The surgical neck is seen as a circumferential constriction inferior to the tubercles, with the shaft continuing distally and widening toward the deltoid tuberosity on the lateral surface. Bone landmarks dominate the frame. Proximal humeral fractures cluster at the surgical neck, and this is the fracture level that raises immediate concern for injury to the axillary nerve and posterior circumflex humeral artery as they course around the humerus near the quadrangular space, just posterior to the surgical neck. A posteriorly oriented illustration helps when teaching why displacement patterns can be subtle on standard AP radiographs yet still compromise the deltoid, producing loss of shoulder abduction strength and sensory deficit over the superolateral arm (the regimental badge area). The focused bony silhouette also supports operative planning discussions where screw placement and plate positioning must respect the proximal cortical thickness and nearby neurovascular structures. Use this illustration in upper limb osteology labs, orthopedic trauma teaching on proximal humerus fracture classification, and surgical anatomy modules covering the axillary nerve at risk during open reduction and internal fixation or shoulder arthroplasty exposure. It also fits figure needs for journal articles, board-review decks, and patient-facing handouts that explain why a surgical neck fracture can affect deltoid function despite an apparently localized bony injury. Anatomical accuracy verified by SciePro's Medical Advisory Board.