Rib 3 (left) — true rib

Function

A classic true rib: it hoops from spine to sternum, its intercostal groove sheltering the nerve-vessel triad, and its motion pumps lymph and venous blood during breathing.

Landmarks

• Costal groove (intercostal nerve and vessels)
• Tubercle
• Angle

Articulations (joints)

• T2–T3 vertebrae
• Sternum via third costal cartilage

Clinical relevance

Upper rib fractures signal significant chest trauma; assess for underlying lung contusion and pneumothorax.