Audio LecturePro Feature External Oblique 0:00 / 0:00 1x 0.25x 0.5x 0.75x 1x 1.25x 1.5x 1.75x 2x 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 (2026) Fig 1Lateral view of the abdominal wall. The external oblique and its aponeurotic fibres are visible. 3D ModelPro Feature 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 Dissection AtlasPro Feature 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 In gratitude to our body donorsLearn more In gratitude to our body donors We are deeply grateful to the individuals who chose to donate their bodies for the advancement of medical education. Their generosity makes these images possible and provides students and healthcare professionals with an invaluable opportunity to study human anatomy. We recognise the profound contribution made by each donor and their families, and we use these images with the dignity and respect their gift deserves. Acknowledge Frequent questions What is the external oblique muscle? The external oblique is the largest and most superficial muscle of the anterior abdominal wall. It plays a crucial role in movements such as torso flexion and contralateral rotation. Where does the external oblique muscle attach? The external oblique originates from the lower ribs, specifically ribs 5-12, and inserts onto the iliac crest and the pubic tubercle. These attachments are essential for its function in stabilising the torso. What are the primary actions of the external oblique muscle? The main actions of the external oblique include flexing the torso and facilitating contralateral rotation. These movements are important for various physical activities and maintaining posture. Which nerves innervate the external oblique muscle? The external oblique is innervated by the thoracoabdominal nerves (T7-T11) and the subcostal nerve (T12). This innervation is vital for muscle contraction and function. What is the blood supply to the external oblique muscle? The blood supply to the external oblique comes from the lower posterior intercostal arteries, the subcostal artery, and the deep circumflex iliac artery. Adequate blood flow is important for the muscle's health and function. Rate This Article