Origin: Posterior surface of middle 3/5 of the tibia.
Insertion: Branches into 4 tendons that insert the plantar surface of the base of distal phalanx of the 4 lesser toes.
Action:
- Flexes phalanges at all phalangeal and metatarsophalangeal articulations of 2nd to 5th toes.
- Plantarflexes and inverts foot at the ankle.
Synergists: TIbialis posterior, FHL, FDB.
Nerve Supply: Tibial, L5, S1.