El músculo extensor del índice es un músculo situado en el compartimento profundo de la parte posterior del antebrazo. El tendón del músculo extensor del índice pasa a través del cuarto compartimento extensor de la muñeca. Permite que la extensión del dedo índice sea independiente de la de los demás dedos. Inserciones: se origina en la superficie posterior del cúbito y la membrana interósea. Se adhiere a la cubierta extensora del dedo índice. Acciones: extensión del dedo índice en las articulaciones interfalángicas y metacarpofalángicas. 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 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 function of the extensor indicis muscle? The extensor indicis muscle primarily facilitates the independent extension of the index finger at the metacarpophalangeal and interphalangeal joints. This allows for precise movements of the index finger without affecting the other digits. Where does the extensor indicis muscle originate? The extensor indicis muscle originates from the posterior surface of the ulna and the interosseous membrane. Its unique attachment point enables its specific function in finger extension. How is the extensor indicis muscle innervated? The extensor indicis muscle is innervated by the radial nerve, specifically through its posterior interosseous branch. This innervation is crucial for the muscle's motor function. What is the blood supply to the extensor indicis muscle? The extensor indicis muscle receives its blood supply from the ulnar artery. This vascularisation supports the muscle's metabolic needs during its function. In which compartment of the forearm is the extensor indicis muscle located? The extensor indicis muscle is located in the deep posterior compartment of the forearm. This positioning is essential for its role in extending the index finger. Rate This Article