1. gastrocnemius; O = femur; I = Achilles tendon; A = flexes shank and foot

2. tibialis posticus; O = tibiofibula; I = tarsal bones; A = flexes foot

3. extensor cruris; O = femur; I = tibiofibula; A = extends shank

4. tibialis anticus longus; O = femur; I = tarsal bones; A = lifts foot and flexes ankle