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- Lies in midline of anterior chest wall
- Flat bone
- 3 parts: manubrium sterni, body of sternum and xiphoid process
Manubrium
- Upper part
- Articulates with body at manubriosternal joint
- Articulates with clavicles, first costal cartilage and upper part of second costal cartilage
- Lies opposite third and fourth thoracic vertebrae
Body
- Articulates above with manubrium at manubriosternal joint
- Articulates below with xiphoid process at xiphisternal joint
- Each side articulates with second to seventh costal cartilages
Xiphoid process
- Thin plate of cartilage
- Ossifies at proximal end during adult life
- No ribs or costal cartilages attached to it
Sternal angle
- Angle of Louis
- Articulation of manubrium with body of sternum
- At level of second costal cartilage and opposite to D4-D5 disc
Xiphisternal joint
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