Flexor Digitorum Longus 1.Origin: *posterior surface of tibia *crural fascia 2. Insertion: *plantar surface of bases of the 2-5th distal phalanges 3. Action: *primarily flexes 2nd - 5th toes *weak plantarflexor *weak inversion & adduction of foot 4.Blood: *peroneal artery *posterior tibial artery 5. Nerve: *tibial nerve * L5 *S1

Tibialis Posterior 1. Origin: *posterior, proximal tibia *interosseous membrane *medial surface of fibula 2. Insertion: *navicular tuberosity (principle) *all 3 cuneiforms (plantar surface) *bases of 2nd-4th metatarsals *cuboid *sustentaculum tali of calcaneus 3. Action: *stabilizes ankle *inversion & adduction of foot *prevents hyperpronation while in gait *weak plantarflexion of ankle 4. Blood: *peroneal artery *posterior tibial artery 5. Nerve: *tibial nerve *L5 *S1

Flexor Hallucis Longus 1. Origin: *posterior, inferior 2/3 of fibula *interosseous membrane *crural fascia & posterior intermuscular septum 2. Insertion: *plantar surface of distal phalanx of hallux 3. Action: *flexes big toe (hallux) *weak plantarflexion of the foot *weak inversion & adduction of foot 4. Blood: *peroneal artery *posterior tibial artery 5. Nerve: *tibial nerve * L5 *S1 & 2

Peroneus Longus Origin: *head of the fibula *proximal 2/3 of lateral fibula *adjacent intermuscular septum Insertion: *plantar surface of cuboid *base of 1st & (2nd) metatarsal *plantar surface of medial cuneiform Action: *eversion & abduction of the foot *weak plantarflexion of the foot at the transverse tarsal joint Blood: *muscular branches of the peroneal artery Nerve: *superficial peroneal nerve * L4 &5 *S1

Peroneus Brevis 1. Origin: *distal 2/3 of lateral fibula * posterior and anterior intermuscular septum 2. Insertion: *tuberosity on lateral aspect of base of 5th metatarsal 3. Action: *eversion & abduction of the foot *weak plantarflexion of foot 4. Blood: *muscular branches of the peroneal artery 5. Nerve: *superficial peroneal nerve *L4 &5 *S1