Dr/ Toaa Fahmy on Instagram: "Angle of Louis, also known as the sternal angle, is a crucial anatomical landmark on the front of the chest where the manubrium (upper part of the breastbone) joins the body of the sternum, marking the level of the second rib, the beginning of the aortic arch, and the trachea’s bifurcation. This palpable angle helps clinicians count ribs for examinations, identify important heart/lung structures, and serves as the reference point for the transverse thoracic plane ….