BoneIrregular bone
Seventh costal cartilage
Cartilago costalis VII sinistra
- Location:
- Thorax — costal margin
- Paired structure: one on the left and one on the right side of the body.
Function
The keystone of the costal margin — where the cage's elastic lower rim reaches its lowest swing.
Landmarks
- Costal margin apex
Articulations (joints)
- Seventh rib
- Sternum tip, joining ribs 8–10's cartilage
Clinical relevance
The infrasternal (subcostal) angle widens in chronic lung hyperinflation (barrel chest).
Educational anatomy reference, not medical advice. About this content.