Audio LecturePro Feature Rectus Abdominis 0:00 / 0:00 1x 0.25x 0.5x 0.75x 1x 1.25x 1.5x 1.75x 2x 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. 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 rectus abdominis muscle? The rectus abdominis is a paired vertical muscle located on the anterior abdominal wall, flanking the midline. It plays a crucial role in abdominal compression and pelvic stability. Where does the rectus abdominis originate and insert? This muscle originates from the crest of the pubis and inserts onto the xiphoid process of the sternum and the costal cartilage of ribs 5-7. These attachments facilitate its function in movement and stability. What actions does the rectus abdominis perform? The rectus abdominis assists in compressing abdominal contents, stabilises the pelvis during ambulation, and helps depress the ribs. These actions are vital for maintaining posture and core stability. What nerves innervate the rectus abdominis? The rectus abdominis is innervated by the thoracoabdominal nerves, specifically T7 to T11. This innervation is essential for muscle contraction and function. What is the blood supply to the rectus abdominis? The blood supply to the rectus abdominis comes from the inferior and superior epigastric arteries, along with contributions from the posterior intercostal, subcostal, and deep circumflex arteries. This vascularisation supports the muscle's metabolic needs. Rate This Article