Rib 6 (left) — true rib

Function

Lower true rib linking the sternum to the thoracic spine and sharing the anterior endplate of the costal margin with rib 7.

Landmarks

• Costal groove
• Angle

Articulations (joints)

• T5–T6 vertebrae
• Sternum via sixth costal cartilage

Clinical relevance

Three or more adjacent ribs broken in two places create a flail segment that moves paradoxically with breathing.