PLANTAR INTEROSSEI
Origin
Inferomedial shafts of 3rd , 4th and 5th MTs (single heads)
Action
Adduct 3rd 4th and 5th toes to axis of 2nd toe, Assist lumbricals in extending IP jnts whilst flexing MTP jnts
Insertion
Med sides of bases of prox phalanges with slips to dorsal extensor expansions of 3rd, 4th and 5th toes
Nerve
Deep br of lat plantar N (S2,3)