Audio LecturePro Feature Transversus Abdominis 0:00 / 0:00 1x 0.25x 0.5x 0.75x 1x 1.25x 1.5x 1.75x 2x The transversus abdominis is a muscle of the anterior abdominal wall. It is the deepest of the flat abdominal wall muscles. Attachments: Originates from the inguinal ligament, costal cartilages 7-12, the iliac crest and thoracolumbar fascia. It inserts onto the conjoint tendon, xiphoid process, linea alba and the pubic crest. Actions: Compression of abdominal contents. Innervation: Thoracoabdominal nerves (T7-T11), subcostal nerve (T12) and branches of the lumbar plexus. Blood supply: Lower posterior intercostal and subcostal arteries, superior and inferior epigastric arteries, superficial and deep circumflex arteries, posterior lumbar 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 inferior epigastric artery arising from the external iliac artery. It then ascends on the posterior surface of the rectus abdominis. Dissection of the inferior epigastric artery arising from the external iliac artery. It then ascends on the posterior surface of the rectus abdominis. 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 transversus abdominis? The transversus abdominis is the deepest muscle of the anterior abdominal wall, playing a crucial role in stabilising the core and compressing abdominal contents. Where does the transversus abdominis originate and insert? This muscle originates from the inguinal ligament, costal cartilages 7-12, iliac crest, and thoracolumbar fascia, and it inserts onto the conjoint tendon, xiphoid process, linea alba, and pubic crest. What are the primary actions of the transversus abdominis? The primary action of the transversus abdominis is the compression of abdominal contents, which contributes to core stability and intra-abdominal pressure regulation. Which nerves innervate the transversus abdominis? The transversus abdominis is innervated by the thoracoabdominal nerves (T7-T11), the subcostal nerve (T12), and branches from the lumbar plexus. What is the blood supply to the transversus abdominis? The blood supply to the transversus abdominis comes from the lower posterior intercostal and subcostal arteries, as well as the superior and inferior epigastric arteries and circumflex arteries. Rate This Article