BoneFlat bone

Rib 11 (left) — floating rib

Latin: Costa XI sinistra

Location: Posterior lower thorax

View the rib 11 (left) — floating rib in 3D

Function

A short floating rib with no anterior attachment — its free tip moves independently, cushioning the kidney behind the abdominal wall muscles.

Landmarks

  • Single facet
  • Free anterior tip
  • Short slender shaft

Articulations (joints)

  • T11 vertebral body only

Clinical relevance

Eleventh and twelfth rib fractures puncture the kidney, adrenal and spleen; their tenderness lies deep to the back muscles.

Educational anatomy reference, not medical advice. About this content.