The four dorsal interossei are the most superior muscles in the sole of the foot and abduct the second to fourth toes relative to the long axis through the second toe (Fig. 6.123). All four muscles are bipennate and originate from the sides of adjacent metatarsals.
The tendons of the dorsal interossei insert into the free margin of the extensor hoods and base of the proximal phalanges of the toes.