Scalenus pleuraris muscle

A.Prof Frank Gaillard 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 tubercule to insert into the suprapleural membrane (of Sibson) and the first rib behind 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 C7
  • insertion: suprapleural membrane; inner border of first rib

Related pathology

Anatomy: Head and neck
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Article information

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

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