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)