Dorsal interossei: Dorsal interossei of the foot are four muscles situated between the metatarsal bones. Each arises from two metatarsals.
Origin: Originates from the sides of metatarsals one to five.
Insertion: The first muscle connects to the medial side of the proximal phalanx of the second digit. The second to fourth interossei connect to the lateral sides of the proximal phalanxes of digits two to four.
Function: Abduct digits two to four and flex the metatarsophalangeal joints.
Nerve Supply: Lateral plantar nerve from the tibial nerve.