Serratus Posterior Superior

Written by Sharanya Bhaskaran

Last updated January 5, 2023 • 3 Revisions •

The serratus posterior superior is a muscle within the intermediate compartment of the back. It is a thin and rectangular in shape, and lies deep to the rhomboid muscles in the upper back.

  • Attachments: Originates from the lower part of the ligamentum nuchae, and the cervical and thoracic spines (usually C7 – T3). The muscle fibres run in an inferolateral direction, attaching to ribs 2 – 5.
  • Actions: Elevates ribs 2 – 5.
  • Innervation: Intercostal nerves T2 – T5.
  • Blood Supply: Posterior intercostal arteries.

Fig 1
The intermediate back muscles; serratus posterior superior and inferior.

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