Palmaris Longus - Podcast Version 0:00 / 0:00 1x 0.25x 0.5x 0.75x 1x 1.25x 1.5x 1.75x 2x The palmaris longus is a muscle within the superficial compartment of the anterior forearm. It is absent in approximately 15% of the population. Attachments: Originates from the medial epicondyle of the humerus. It attaches to the flexor retinaculum and palmar aponeurosis of the hand. Actions: Flexion (weak) at the wrist. Innervation: Median nerve. Blood supply: Ulnar artery. By TeachMeSeries Ltd (2026) Fig 1The superficial muscles of the anterior forearm. 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 Atlas Prosetion of the superficial compartment of the anterior forearm Prosetion of the superficial compartment of the anterior forearm 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 Frequent questions What is the palmaris longus muscle? The palmaris longus is a muscle located in the superficial compartment of the anterior forearm. It plays a minor role in wrist flexion and is absent in about 15% of individuals. Where does the palmaris longus originate and attach? This muscle originates from the medial epicondyle of the humerus and attaches to the flexor retinaculum and the palmar aponeurosis of the hand. What is the primary action of the palmaris longus? The primary action of the palmaris longus is weak flexion at the wrist. Although its contribution to wrist movement is minimal, it assists in gripping actions. Which nerve innervates the palmaris longus muscle? The palmaris longus is innervated by the median nerve, which is responsible for transmitting motor signals to this muscle. What is the blood supply to the palmaris longus? The blood supply to the palmaris longus comes from the ulnar artery, which provides essential nutrients and oxygen for the muscle's function. Rate This Article