1. MUSCLES OF THE LEG

2. MUSCLES OF THE POSTERIOR LEG
Gastrocnemius: two bellies
Soleus: deep to gastroc, but wider
Plantaris: absent in approx. 10% of people
Popliteus: deepest muscle of posterior knee
Tibialis posterior
Flexor digitorum longus
Flexor hallucis longus

3. GASTROCNEMIUS O- (posterior) condyles of the femur
I- Calcaneus via Achilles tendon
A- Plantar flexes foot
Plantar flexion

4. GASTROCNEMIUS

5. SOLEUS O-Upper fibula & tibia I- Calcaneus via Achilles tendon
A- Plantar flexes foot

6. SOLEUS

7. PLANTARIS O- Above lateral head of gastrocnemius (lateral epicondyle)
I- Calcaneus, via (just medial to) the Achilles tendon
A- Plantar flexes of foot

8. POPLITEUS O- (Posterior) lateral condyle of femur
I- Posterior proximal tibia
A- Medially rotates & flexes leg
Can laterally rotate femur
Helps unlock the knee

9. TIBIALIS POSTERIOR O- Posterior tibia, fibula
I- Tarsals & Metatarsals (2nd – 4th)
A- Inverts & plantar flexes foot

10. FLEXOR DIGITORUM LONGUS
O- Inferior-posterior tibia
I- Four outer phalanges (plantar surface)
A- Plantar flexes and inverts the foot, flexes toes 2-5

11. FLEXOR DIGITORUM LONGUS

12. FLEXOR HALLUCIS LONGUS
O- Inferior-posterior fibula
I- Plantar surface of big toe
A- Plantar flexes & inverts foot, flexes big toe

13. Tibialis Posterior Flexor Digitorum Longus Flexor Hallucis Longus

14. ANTERIOR/LATERAL MUSCLES OF THE LEG
Tibialis anterior
Extensor digitorum longus
Extensor hallucis longus
Lateral
Peroneus Group (longus & brevis)
Anterior Retinaculum:
Secures (“retains”) insertion tendons

15. TIBIALIS ANTERIOR O- Proximal-lateral tibia
I- Medial tarsal (cuneiform), first metatarsal
A- Dorsiflexes & inverts foot

16. TIBIALIS ANTERIOR

17. TIBIALIS ANTERIOR: Note insertion tendon

18. EXTENSOR DIGITORUM LONGUS
O- Lateral tibial condyle, fibula
I- Dorsal surface of phalanges 2-5
A- Extends toes 2-5, dorsiflexes and everts foot

19. EXTENSOR DIGITORUM LONGUS

20. EXTENSOR DIGITORUM LONGUS: Note insertion tendons

21. EXTENSOR HALLUCIS LONGUS
O- Medial aspect of fibula
I- Dorsal surface of big toe
A- Dorsal flexes & inverts the foot, extends the big toe

22. PERONEUS Group O- Proximal/distal-lateral fibula
I-plantar surface of tarsals
A- Plantar flexes & everts foot

23. PERONEUS

24. PERONEUS BREVIS O- Distal-lateral fibula I- Fifth metatarsal
A- Plantar flexes & everts foot