Final answer:
The gastrocnemius muscle originates from the femur and inserts into the calcaneal tendon (Achilles tendon) that attaches to the calcaneal bone of the ankle.
Step-by-step explanation:
The gastrocnemius muscle originates from the femur and inserts into the calcaneal tendon (Achilles tendon) that attaches to the calcaneal bone of the ankle. Its main action is to plantarflex the foot, which means it helps to point the toes downward.
Additionally, it also assists in flexing the leg at the knee joint.