Dorsal Interossei (Hand) - Podcast Version 0:00 / 0:00 1x 0.25x 0.5x 0.75x 1x 1.25x 1.5x 1.75x 2x The dorsal interossei are intrinsic muscles of the hand. They are located superficially on the dorsum of the hand, and can be palpated between the metacarpal heads. Attachments: Each interossei originates from the lateral and medial surfaces of the metacarpals. They attach into the extensor hood and proximal phalanx of each finger. Actions: Abduction of the digits. Assists in flexion at the metacarpophalangeal joints and extension at the interphalangeal joints. Innervation: Ulnar nerve. Blood Supply: Dorsal metacarpal arteries By TeachMeSeries Ltd (2026) Fig 1The dorsal and palmar interossei of the hand. 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 dorsal aspect of the hand, demonstrating the dorsal interossei. Prosection of the dorsal aspect of the hand, demonstrating the dorsal interossei. 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 dorsal interossei muscles of the hand? The dorsal interossei are intrinsic muscles located on the back of the hand, positioned between the metacarpal heads. They play a crucial role in finger movement and stability. What is the primary function of the dorsal interossei? The main function of the dorsal interossei is to abduct the fingers. They also assist with flexion at the metacarpophalangeal joints and extension at the interphalangeal joints. Where do the dorsal interossei muscles attach? Each dorsal interosseus muscle originates from the lateral and medial surfaces of the metacarpals and attaches to the extensor hood and proximal phalanx of each finger. This arrangement allows for effective movement and control of the digits. Which nerve innervates the dorsal interossei? The dorsal interossei are innervated by the ulnar nerve. This nerve supply is essential for the proper functioning of these muscles during hand movements. What is the blood supply for the dorsal interossei muscles? The dorsal interossei receive their blood supply from the dorsal metacarpal arteries. This vascularisation is important for maintaining the health and function of these muscles. Rate This Article