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
1. Origin:
Tibialis Posterior
*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
• Origin:
Peroneus Longus
*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