Clavicular Notch Of The Sternum, Posterior View

Description

Manubrium sterni fills the frame from a posterior thoracic viewpoint, with the clavicular notch (incisura clavicularis) forming a shallow concavity at the superolateral margin where the medial end of the clavicle meets the sternum at the sternoclavicular joint. Medial to each notch, the jugular (suprasternal) notch defines the superior border, while the lateral edge continues inferiorly toward the first costal notch for rib 1. The posterior surface is smooth and gently concave toward the superior mediastinum. Orientation is unambiguous. Sternoclavicular alignment matters because this small articular interface is the only true synovial connection between the upper limb and axial skeleton, and posterior displacement of the medial clavicle can endanger the brachiocephalic veins, trachea, and esophagus immediately deep to the manubrium. Posterior viewing supports teaching of why anterior swelling can mask a clinically significant posterior sternoclavicular dislocation, and it helps correlate CT findings by anchoring the medial clavicle to the exact contour of the incisura clavicularis rather than to the broader manubrial outline. Small details count. Use this illustration in gross anatomy and musculoskeletal modules when introducing the sternoclavicular joint, first rib articulation, and mediastinal relationships, or in orthopedic and emergency medicine education when discussing reduction strategies and when not to rely on surface appearance alone. Medical publishers can also place it alongside cross-sectional thoracic imaging to orient readers to the posterior manubrial surface and the risk zone deep to the sternoclavicular complex. Anatomical accuracy verified by SciePro's Medical Advisory Board.