Gastrocnemius

A: Flex the knee (tibiofemoral joint)Plantar flex the ankle (talocrural joint) 

O:Condyles of the femur, posterior surfaces

I:Calcaneus via calcaneal tendon.

Soleus

A: Plantar flex the ankle (talocrural joint

O: Soleal line; proximal, posterior surface of tibia; 

I: posterior aspect of head of fibula

Calcaneus via calcaneal tendon 

Plantaris

A: Weak plantar flexion of the ankle (talocrural joint) Weak flexion of the knee (tibiofemoral joint)

O: Lateral supracondylar line of femur

I: Calcaneus via calcaneal tendon

Popliteus

A: Medially rotate the flexed knee (tibiofemoral joint) Flex the knee (T/F joint

O: Lateral condyle of the femur

I: Proximal, posterior aspect of tibia

Fibularis Longus

A: Evert the foot Assist to plantar flex the ankle (talocrural joint)

O: Head of fibula and proximal two-thirds of lateral fibula

I: Base of the first metatarsal and medial cuneiform 

Fibularis Brevis

A: Evert the foot Assist to plantar flex the ankle (talocrural joint

O: Distal two-thirds of lateral fibula

I: Tuberosity of fifth metatarsal

Extensors of the Ankle and Toes

A: Invert the foot Dorsiflex the ankle (talocrural joint)

O: Lateral condyle of tibia; proximal, lateral surface of tibia; and interosseous membrane

I: Medial cuneiform and base of the first metatarsal

Flexors of the Ankle and Toes

A: Flex the second through fifth toes (metatarsophalangeal and interphalangeal joints) Weak plantar flexion of ankle (talocrural joint) Invert the foot

O: Middle, posterior surface of tibia

I: Distal phalanges of second through fifth toes