Part of the TeachMe Series

External Oblique

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Original Author(s): Aren Mnatzakanian
Last updated: December 13, 2023
Revisions: 4

Original Author(s): Aren Mnatzakanian
Last updated: December 13, 2023
Revisions: 4

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The external oblique is a muscle of the anterior abdominal wall. It is the largest and most superficial of the flat abdominal wall muscles.

  • Attachments: Originates from ribs 5-12 and inserts onto the iliac crest and pubic tubercle.
  • Actions: Flexion and contralateral rotation of the torso.
  • Innervation: Thoracoabdominal nerves (T7-T11) and subcostal nerve (T12).
  • Blood supply: Lower posterior intercostal arteries, subcostal artery, deep circumflex iliac artery.

    Fig 1 – Lateral view of the abdominal wall. The external oblique and its aponeurotic fibres are visible.