Non-articulated Supernumerary Rib

**Semantic type:** Finding

**Definition:** An additional rib-like structure usually between two other ribs, not articulated with the vertebral column. (Makris S, Solomon HM, Clark R, Shiota K, Barbellion S, Buschmann J, Ema M, Fujiwara M, Grote K, Hazelden KP, Hew KW, Horimoto M, Ooshima Y, Parkinson M, Wise LD. Terminology of developmental abnormalities in common laboratory mammals (Version 2). Part B. Birth Defects Res B Dev Reprod Toxicol. 2009 Aug;86(4):227-327.)

**Synonyms:** - Floating Rib - SUPERNUMERARY RIB, NON-ARTICULATED