Origin of Dorsal Interossei
Dorsal 1 - 4: Adjacent sides of two metacarpals (bipennate muscles)
Insertion of Dorsal Interossei
Dorsal 1 - 4: Extensor expansions and bases of proximal phalanges of digits 2 - 4
Muscle Function of Dorsal Interossei
Dorsal 1 - 4: Abduct digits from axial line and act with lumbricals to flex metacarpophalangeal joints and extend interphalangeal joints
Artery Supply of Dorsal Interossei
Dorsal 1 - 4: Dorsal and palmar metacarpal arteries
Dorsal Interossei Muscles Video