Interosseous Muscles, Palmar

Origin Palmar 1 - 3: Palmar surfaces of 2nd, 4th and 5th metacarpals (unipennate muscles)
Insertion Palmar 1 - 3: Extensor expansions of digits and bases of proximal phalanges of digits 2, 4 and 5
Action Palmar 1 - 3: Adduct digits toward axial line and assist lumbricals in flexing metacarpophalangeal joints and extending interphalangeal joints
Innervation Deep branch of ulnar nerve (C8 and T1) (C8, T1)
Arterial Supply Palmar 1 - 3: Palmar metacarpal arteries

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Muscle Atlas of the Extremities