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)