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. By TeachMeSeries Ltd (2025) Fig 1Lateral view of the abdominal wall. The external oblique and its aponeurotic fibres are visible. Pro Feature - 3D Model You've Discovered a Pro Feature Access our 3D Model Library Explore, cut, dissect, annotate and manipulate our 3D models to visualise anatomy in a dynamic, interactive way. Learn More Pro Feature - Dissection Images Dissection of the anterolateral abdominal wall Dissection of the anterolateral abdominal wall You've Discovered a Pro Feature Access our Dissection Image Library Enhance your understanding with high-resolution dissection images showcasing real-life anatomy. Learn More Print Article Rate This Article