The Costal Notches Of The Sternum In Lateral View

Description

Along the lateral margin of the sternum, the animation tracks the costal notches (incisurae costales) as a stepped series of articular depressions from the manubrium through the body of the sternum. Superiorly, the first costal notch lies adjacent to the manubrium near the jugular and clavicular regions, while the second rib relates to the sternal angle (manubriosternal joint) where the manubrium meets the sternal body. As the viewpoint holds in lateral profile, the third through seventh notches align inferiorly along the sternal body, clarifying how the costal cartilages approach from lateral to medial to form the anterior thoracic wall. Orientation matters here. Counting ribs and locating the second costal cartilage at the sternal angle is a daily clinical move for surface anatomy, chest tube landmarking, and auscultation teaching, yet it is often confused when learners only see the sternum in anterior view. By presenting the notches sequentially in lateral view, the animation makes the vertical “stair-step” spacing legible and reinforces the relationship between the manubriosternal junction and the rib 2 attachment, a key reference point when translating between palpation and imaging. Small structure, big consequence. Use this animation in gross anatomy and osteology modules covering the thoracic cage, in radiographic anatomy lectures that correlate rib levels to mediastinal landmarks, or in procedure-oriented education where precise rib counting reduces errors (for example, selecting intercostal spaces for thoracostomy or pericardiocentesis approaches). It also fits cleanly into textbook sections on the sternum, costal cartilages, and anterior rib articulations. Anatomical accuracy verified by SciePro's Medical Advisory Board.