Gastrocnemius Muscle

The most superficial and prominent muscle of the posterior crural (calf) compartment. It comprises medial and lateral heads that originate from the posterior aspects of the corresponding femoral condyles. Distally, it merges with the soleus muscle to form the calcaneal (Achilles) tendon, which inserts onto the posterior surface of the calcaneus. Biomechanically, it spans two joints, functioning as a powerful plantarflexor of the ankle and an accessory flexor of the knee, making it essential for dynamic propulsion during the gait cycle.