Audio LecturePro Feature Extensor Digitorum 0:00 / 0:00 1x 0.25x 0.5x 0.75x 1x 1.25x 1.5x 1.75x 2x The extensor digitorum is a muscle within the superficial compartment of the posterior forearm. The tendons of the extensor digitorum pass through the 4th extensor compartment at the wrist. Attachments: Originates from the lateral epicondyle of the humerus. The tendon divides into four in the distal forearm, and inserts into the extensor hood of each digit. Actions: Extension of the digits at the interphalangeal and metacarpophalangeal joints. Innervation: Radial nerve (deep branch). Blood supply: Radial artery By TeachMeSeries Ltd (2026) Fig 1The muscles in the superficial layer of the posterior forearm. 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 Prosection of the superficial layer of muscles within the posterior compartment of the forearm. Prosection of the superficial layer of muscles within the posterior compartment of the 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 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 extensor digitorum muscle? The extensor digitorum is a muscle located in the superficial compartment of the posterior forearm, responsible for extending the fingers. Where does the extensor digitorum originate from? This muscle originates from the lateral epicondyle of the humerus, providing a stable point for its function. How does the extensor digitorum insert into the fingers? The tendon of the extensor digitorum divides into four parts in the distal forearm and inserts into the extensor hood of each finger. What actions are performed by the extensor digitorum? The primary actions of the extensor digitorum include the extension of the fingers at both the interphalangeal and metacarpophalangeal joints. Which nerve innervates the extensor digitorum muscle? The extensor digitorum is innervated by the deep branch of the radial nerve, which is essential for its motor function. Rate This Article