Dorsal 1 - 4: Adjacent sides of two metacarpals (bipennate muscles) Palmar 1 - 3: Palmar surfaces of 2nd, 4th and 5th metacarpals (unipennate muscles)
Insertion
Dorsal 1 - 4: Extensor expansions and bases of proximal phalanges of digits 2 - 4 Palmar 1 - 3: Extensor expansions of digits and bases of proximal phalanges of digits 2, 4 and 5
Action
Dorsal 1 - 4: Abduct digits from axial line and act with lumbricals to flex metacarpophalangeal joints and extend interphalangeal joints Palmar 1 - 3: Adduct digits toward axial line and assist lumbricals in flexing metacarpophalangeal joints and extending interphalangeal joints
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