<prompt> Flexion of metacarpophalangeal joint is produced by all exceptLumbricalsDorsal interosseiPalmar interosseiExtensor pollicus longus  <response>: Flexion of metacarpophalangeal joint is by lumbricals and both palmar and dorsal interossei. Abduction is by the action of dorsal interossei. Adduction is by the actions of palmar interossei . B D Chaurasia 7th edition Page no: 163 