Posterior Compartment of Leg

Question 1

Gastrocnemius

Answer 1

O:
Lateral head–lateral aspect of lateral condyle of femur
Medial head–popliteal surface of femur, superior to medial condyle

I:
Posterior surface of calcaneus via tendo calcaneus

A:
Plantar flexes
Raises heel during walking
Flexes knee

N:
Tibial nerve S1, S2

Question 2

Soleus

Answer 2

O:
Posterior aspect of head of fibula 
Superior 1/4 of fibula 
Soleal line 
Medial border of tibia 

I:
Posterior surface of calcaneus
via tendo calcneus

A:
Plantar flexes foot
Raises heel in walking

N:
Tibial nerve S1, S2

Question 3

Plantaris

Answer 3

O:
Inferior end of lateral supracondylar line of femur
Oblique popliteal ligament

I:
Fuses with tendo calcaneus

A:
Weakly assists in plantar flexion
Knee flexion

N:
Tibial nerve S1, S2

Question 4

Popliteus

Answer 4

O:
Lateral surface of lateral condyle of femur and lateral meniscus

I:
Posterior surface of tibia, superior to soleal line

A:
Weakly flexes knee
Unlocks extended knee
-Medially rotates tibia on fixed femur
-Laterally rotates femur on fixed tibia

N:
Tibial L4, L5, S1

Question 5

Flexor Hallucis Longus

Answer 5

O:
Inferior 2/3 of posterior fibula
Inferior interosseous membrane

I:
Base of distal phalanx of hallux

A:
Flexes hallux at all joint
Plantar flexes foot
Supports longitudinal arch of foot

N:
Tibial n S2, S3

Question 6

Flexor Digitorum Longus

Answer 6

O:
Medial part of posterior tibia
Inferior to soleal line by broad aponeurosis to fibula

I:
Bases of distal phalanges of lateral 4 digits

A:
Flexes lateral 4 digits
Plantarflexes
Supports medial longitudinal arch of foot

N:
Tibial n S2, S3

Question 7

Tibialis Posterior

Answer 7

O:
Interosseous membrane
Posterior surface of tibia, inferior to soleal line
Posterior surface of fibula

I:
Tuberosity of navicular
All 3 cuneiform bones
Bases of 2nd, 3rd, 4th mets

A:
Plantarflexes
Inverts foot
Supports the transverse and medial longitudinal arch

N:
Tibial n L4, L5