Author: Dr Peter de Souza
Last modified: 23 November 2023

The subclavius muscle is a small triangular shaped muscle which lies interposed between the clavicle and the first rib.


  • 1st rib and Costal cartilage of 1st rib


  • Subclavian groove of clavicle on the inferior surface of the middle third of the clavicle


  • Depression of  clavicle
  • Elevation of first rib
  • Stabilisation of the sternoclavicular joint via the above motions


  • Nerve to subclavius

Blood Supply

  • Pectoral branch of the thoracoacromial trunk