Superficial Muscles of 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 calcaneal tendon
N- Tibial Nerve S1 S2
A- 1. Plantarflexes ankle when knee is extended
2. Raises heel during walking
3. Flexes leg at knee joint

Question 2

Plantaris

Answer 2

O- Inferior end of lateral supracondylar line of femur; oblique popliteal ligament
I- Posterior surface of calcaneus via calcanea tendon
N- Tibial Nerve
A- Weakly assists gastrocnemius in plantar flexing ankle

Question 3

Soleus

Answer 3

O- 1. Posterior aspect of head and superior quarter of posterior fibula
2. Solid line and middle third of medial border of tibia
3. Tendinous arch extending between bony attachments
I- Posterior surface of calcaneus via calcaneal tendon
N- Tibial Nerve S1 S2
A- 1. Plantarflexes ankle independent of position of knee
2. Steadies leg on foot