El músculo abductor largo del pulgar es un músculo situado en el compartimento profundo de la parte posterior del antebrazo. El tendón del músculo abductor largo del pulgar atraviesa el primer compartimento extensor de la muñeca, donde contribuye al borde radial de la tabaquera anatómica. Inserciones: se origina en la membrana interósea y las superficies posteriores adyacentes del radio y el cúbito. Se inserta en la cara externa de la base del primer metacarpiano. Acciones: abducción del pulgar. Inervación: nervio radial (rama interósea posterior). Irrigación sanguínea: arteria cubital. By TeachMeSeries Ltd (2026) Fig. 1: músculos en la capa profunda de la parte posterior del antebrazo. 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 Borders and contents of the anatomical snuffbox Borders and contents of the anatomical snuffbox 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 location of the abductor longus muscle of the thumb? The abductor longus muscle of the thumb is located in the deep compartment of the posterior forearm. It plays a key role in thumb movement. What are the attachments of the abductor longus muscle of the thumb? This muscle originates from the interosseous membrane and the posterior surfaces of the radius and ulna, inserting at the external surface of the base of the first metacarpal. What is the primary action of the abductor longus muscle of the thumb? The primary action of the abductor longus muscle of the thumb is to facilitate the abduction of the thumb. This movement is essential for grasping and pinching. Which nerve innervates the abductor longus muscle of the thumb? The abductor longus muscle of the thumb is innervated by the radial nerve, specifically through its posterior interosseous branch. This innervation is crucial for muscle function. What is the blood supply to the abductor longus muscle of the thumb? The blood supply to the abductor longus muscle of the thumb is provided by the ulnar artery. This vascularisation supports the muscle's metabolic needs during movement. Rate This Article