Supernumerary ribs

Supernumerary ribs occur most commonly as a cervical rib arising from C7 or a lumbar rib arising from L1. In extremely rare situations, there can be sacral, coccygeal, intrathoracic, or aberrant lumbar ribs 3. Rarely supernumerary ribs (cervical and lumbar ribs aside) have been found as 'normal' anatomic variants, without evidence of any clinical sequelae.



Supernumerary ribs have been used as a marker for developmental toxicity bioassays in test animals 2.

Anatomy: Thoracic


Article information

rID: 33797
Section: Anatomy, Gamuts
Synonyms or Alternate Spellings:
  • Supernumerary rib
  • Extra ribs
  • Extra rib
  • Supernumerary ribs (differential)
  • Additional ribs

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Cases and figures

  • Case 1: 13 pairs of ribs and absent radius
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  • Case 2: 14 pairs of ribs
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