Audio LecturePro Feature Pyramidalis 0:00 / 0:00 1x 0.25x 0.5x 0.75x 1x 1.25x 1.5x 1.75x 2x The pyramidalis is a muscle of the anterior abdominal wall. It is a paired, triangular muscle, located superficial to the rectus abdominis. Attachments: Originates from the pubic crest and pubic symphysis before inserting onto the linea alba. Actions: Tenses the linea alba. Innervation: Subcostal nerve (T12). Blood supply: Inferior epigastric artery. Adobe Stock, Licensed to TeachMeSeries Ltd Fig 1The pyramidalis muscle of the anterior abdominal wall. 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 pyramidalis muscle? The pyramidalis is a paired, triangular muscle situated in the anterior abdominal wall, lying superficial to the rectus abdominis. It plays a role in tensing the linea alba. Where does the pyramidalis muscle originate and insert? The pyramidalis originates from the pubic crest and pubic symphysis, inserting onto the linea alba. This positioning allows it to effectively contribute to abdominal wall function. What is the primary action of the pyramidalis muscle? The main action of the pyramidalis muscle is to tense the linea alba. This function aids in stabilising the abdominal wall during various movements. Which nerve innervates the pyramidalis muscle? The pyramidalis muscle is innervated by the subcostal nerve, specifically from the T12 spinal segment. This nerve supply is crucial for the muscle's contraction and function. What is the blood supply to the pyramidalis muscle? The pyramidalis muscle receives its blood supply from the inferior epigastric artery. This vascularisation is important for maintaining the muscle's health and functionality. Rate This Article