Gastrocnemius
O: Medial head = posterior distal femur
Lateral head = lateral femoral condyle
I: Calcaneal tendon --> posterior calcaneus
F: Plantarflexion, knee flexion
N: Tibial nerve S1-2
Plantaris
O: Inferior lateral supracondylar line of femur
I: Calcaneal tendon --> posterior calcaneus
F: Plantarflexion, knee flexion
N: Tibial nerve S1-2
Soleus
O: Soleal line of tibia
Posterior fibular head
I: Calcaneal tendon --> posterior calcaneus
F: Plantarflexion
N: Tibial nerve S1-2
Popliteus
O: Posterior proximal tibia
I: Lateral femoral condyle
F: Laterally rotates femur on fixed tibia (unlocks knee)
N: Tibial nerve L4-S1
Tibialis Posterior
O: Posterior surface of interosseous membrane
Adj. regions of tibia and fibula
I: Navicular tuberosity
Adj medial cuneiform
F: Inversion, plantarflexion, supports medial arch during walking
N: Tibial L4-5
Fibularis Tertuis (not found in every person)
O: Distal medial fibula
I: Base of metatarsal V
F: Dorsiflexion, eversion
N: Deep fibular nerve L5-S1
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