Bone
Sternum
Breastbone
High-yield
The sternal angle (of Louis) marks the 2nd costal cartilage, the T4/T5 disc, and the tracheal bifurcation. Site of bone marrow aspiration.
Overview
A flat bone in the anterior thoracic wall with three parts — manubrium, body, and xiphoid process — anchoring the ribs and clavicles.
Reference facts
- Bone type
Flat
- Key landmarks
Manubrium; Body; Xiphoid process; Sternal angle (of Louis); Jugular (suprasternal) notch; Clavicular notches
- Articulations
Clavicles (sternoclavicular joints); Costal cartilages of ribs 1–7