Scalenus pleuraris muscle

Assoc Prof Craig Hacking and Dr Henry Knipe et al.

The scalenus pleuraris muscle (also known as scalenus minimus) is an anatomical variant; a small inconstantly identified ill-defined muscle usually extending from the C7 anterior tubercle to insert into the suprapleural membrane (of Sibson) and the first rib posterior to the groove for the subclavian artery 4. The presence of a scalenus minimus muscle has been well documented but with poor agreement on exact definition with prevalence ranging from 7.8 to 71.7% of cadaveric studies 4-6


  • origin: anterior tubercle of the transverse process of C7
  • insertion: suprapleural membrane; inner border of first rib

Related pathology

Anatomy: Head and neck

Anatomy: Head and neck

Article information

rID: 35646
Section: Anatomy
Synonyms or Alternate Spellings:
  • Scalenus minimus
  • Sibson's muscle

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