Extensor hoodExtensordigitorum tendonDorsal interosseousmuscleFlexor digitorumprofundus tendonFulcrum ofmetacarpophalangeal jointABCContraction of intrinsicmuscles (lumbricals andinterossei muscles)Deep transversemetacarpal ligamentMiddle fingerFulcrums ofinterphalangeal jointsExtension ofinterphalangeal jointsFlexion ofmetacarpophalangeal jointExtendedFlexedUpstrokePalmar ligamentLumbrical muscle