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3rd and 4th Lumbricals
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3rd and 4th Lumbricals:
Proximal Attachment - Medial three tendons of flexor digitorum profundus
Distal Attachment - Lateral sides of extensor expansions of 2nd-5th digits
Innervation - Deep branch of ulnar nerves
Action - Flex metacarpophalangeal joints; extend interphalangeal joints of 2nd-5th digits