Palmar Interossei (Hand) - Podcast Version TeachMeAnatomy 0:00 / 0:00 1x 0.25x 0.5x 0.75x 1x 1.25x 1.5x 1.75x 2x The palmar interossei are intrinsic muscles of the hand. There are three palmar interossei muscles (although some texts describe a fourth muscle at the base of the proximal phalanx of the thumb). Attachments: Each interossei originates from a medial or lateral surface of a metacarpal, and attaches into the extensor hood and proximal phalanx of same finger. Actions: Adduction of the digits. Assists in flexion at the metacarpophalangeal joints and extension at the interphalangeal joints. Innervation: Ulnar nerve. Blood Supply: Palmar metacarpal arteries By TeachMeSeries Ltd (2025) 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 deeper structures of the hand, demonstrating the palmar interossei. The dorsal interossei are also partially visible. Prosection of the deeper structures of the hand, demonstrating the palmar interossei. The dorsal interossei are also partially visible. 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 Rate This Article