Los lumbricales son músculos intrínsecos de la mano. Existen cuatro músculos lumbricales, cada uno asociado a un dedo. Inserciones: se originan en el tendón del flexor profundo de los dedos. Se insertan en la cara radial de la protuberancia extensora de cada dedo. Acciones: flexión en la articulación metacarpofalángica y extensión en las articulaciones interfalángicas (IF). Inervación: los dos músculos lumbricales laterales (del dedo índice y del dedo medio) están inervados por el nervio mediano. Los dos músculos lumbricales mediales (del dedo meñique y del anular) están inervados por el nervio cubital. Irrigación sanguínea: arcos palmares superficiales y profundos. By TeachMeSeries Ltd (2026) Fig. 1: los músculos lumbricales de la mano. Obsérvese la diferencia entre la estructura semipeniforme y la peniforme. 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 Prosection of the superficial muscles and tendons of the hand. The tendons of the flexor digitorum superficialis can be seen as they pass through the carpal tunnel to insert onto each digit. Prosection of the superficial muscles and tendons of the hand. The tendons of the flexor digitorum superficialis can be seen as they pass through the carpal tunnel to insert onto each digit. 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 are the lumbrical muscles in the hand? The lumbrical muscles are intrinsic muscles of the hand, with four distinct muscles corresponding to each finger. They play a crucial role in hand movements, particularly in flexing and extending the fingers. Where do the lumbrical muscles originate and insert? The lumbrical muscles originate from the tendon of the flexor digitorum profundus and insert on the radial side of the extensor expansion of each finger. This unique attachment allows them to facilitate complex finger movements. What actions do the lumbrical muscles perform? The lumbrical muscles flex the metacarpophalangeal joints while simultaneously extending the interphalangeal joints. This dual action is essential for precise hand functions, such as grasping and manipulating objects. How are the lumbrical muscles innervated? The two lateral lumbrical muscles, associated with the index and middle fingers, are innervated by the median nerve, while the two medial lumbrical muscles, linked to the ring and little fingers, receive innervation from the ulnar nerve. This differential innervation is important for coordinated finger movement. What is the blood supply to the lumbrical muscles? The blood supply to the lumbrical muscles is provided by the superficial and deep palmar arches. This vascularisation is vital for maintaining muscle function and overall hand health. Rate This Article