Anatomical Neck Of The Humerus, Posterior View

Description

Humeral head anatomy dominates this posterior view, with the anatomical neck forming a narrow circumferential groove immediately distal to the articular surface and proximal to the tubercles. Posteriorly, the head’s smooth cartilage-bearing margin sits superior and medial, while the greater tubercle lies more lateral, creating the bony contour that continues into the proximal shaft. The indentation of the anatomical neck is shown as a fine constriction encircling the base of the head, distinct from the more distal surgical neck where the metaphysis transitions into the diaphysis. Bony landmarks read cleanly in relation to the long axis of the brachium. Small but telling. Anatomical neck fractures are uncommon compared with surgical neck injuries, but when they occur they raise immediate concern for humeral head perfusion because the arcuate artery and ascending branches of the anterior circumflex humeral artery course near the capsular attachment at the neck, and disruption at this level is associated with osteonecrosis and fixation failure. A posterior emphasis helps when teaching why the joint capsule reflects onto the anatomical neck and how the posterior humeral head contour relates to glenohumeral stability, Hill-Sachs engagement, and posterior shoulder dislocation patterns. The fixed perspective supports side-by-side correlation with anteroposterior and scapular Y radiographs by anchoring the viewer to the posterior bony silhouette rather than the intertubercular sulcus, which is primarily an anterior landmark. Use this illustration in upper limb osteology labs, shoulder arthroplasty planning lectures, fracture classification figures (Neer and AO/OTA), and orthopedic or radiology publications that need a precise posterior reference for proximal humerus landmarks. Anatomical accuracy verified by SciePro's Medical Advisory Board.