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Palmar Interossei 1st-3rd
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Palmar Interossei 1st-3rd:
Proximal Attachment - Palmar surfaces of 2nd, 4th, and 5th metacarpals
Distal Attachment - Bases of proximal phalanges; extensor expansions of 2nd, 4th, and 5th digits
Innervation - Deep branch of ulnar nerve
Action - Adduct 2nd, 4th, and 5th digits toward axial line; assist lumbricals in flexing metacarpophalangeal joints and extending interphalangeal joints; extensor expansions of 2nd-4th digits