DORSAL INTEROSSEI (FOOT)

Origin

Bipennate from inner aspects of shafts of all MTs

Action

Abduct 2nd , 3rd and 4th toes from axis of 2nd toe. Assist lumbricals in extending IP jnts whilst flexing MTP jnts

Insertion

Bases of prox phalanges and dorsal extensor expansions of med side of 2nd toe and lat sides of 2nd , 3rd,and 4th toes

Nerve

Lat plantar N (1-3: deep br; 4: superficial br) (S2, 3)