The rectus abdominis is a muscle of the anterior abdominal wall. It is a long, paired vertical muscle found on either side of the midline of the anterior abdominal wall. It is split into two by the linea alba. Attachments: Originates from the crest of the pubis bone. It inserts onto the xiphoid process of the sternum and the costal cartilage of ribs 5-7. Actions: As well as assisting the flat muscles in compressing the abdominal viscera, the rectus abdominis also stabilises the pelvis during walking, and depresses the ribs. Innervation: Thoracoabdominal nerves (T7-T11). Blood supply: Inferior epigastric and superior epigastric arteries; contributions from posterior intercostal, subcostal and deep circumflex arteries. By OpenStax [CC BY 4.0], via Wikimedia Commons Fig 1The muscles of the anterolateral abdominal wall. Note how the flat muscles form aponeuroses medially. 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