Gastrocnemius - Podcast Version 0:00 / 0:00 1x 0.25x 0.5x 0.75x 1x 1.25x 1.5x 1.75x 2x The gastrocnemius is a muscle within the superficial compartment of the posterior leg. It has medial and lateral heads and forms the characteristic “calf” shape of the leg. Attachments: The lateral head originates from the lateral femoral condyle. The medial head originates from the medial femoral condyle. The two heads combine to form a single muscle belly. Distally, the muscle belly converges with the soleus muscle to form the calcaneal tendon. This inserts onto the calcaneus. Actions: Plantarflexion at the ankle joint and flexion at the knee joint. Innervation: Tibial nerve. Blood Supply: Medial and lateral sural arteries (branches of the popliteal artery). By TeachMeSeries Ltd (2026) Fig 1The muscles in the superficial layer of the posterior leg. The body of the gastrocnemius has been cut away to expose the underlying musculature. Pro Feature - 3D Model You've Discovered a Pro Feature Access our 3D Model Library Explore, cut, dissect, annotate and manipulate our 3D models to visualise anatomy in a dynamic, interactive way. Learn More Pro Feature - Dissection Atlas Prosection of the superficial structures of the posterior leg. Prosection of the superficial structures of the posterior leg. You've Discovered a Pro Feature Access our Dissection Image Library Enhance your understanding with high-resolution dissection images showcasing real-life anatomy. Learn More Frequent questions What is the gastrocnemius muscle? The gastrocnemius is a prominent muscle located in the superficial compartment of the posterior leg, known for its role in forming the calf's shape. It consists of two heads, the medial and lateral, which merge to create a single muscle belly. What are the attachments of the gastrocnemius muscle? The lateral head of the gastrocnemius originates from the lateral femoral condyle, while the medial head originates from the medial femoral condyle. Both heads converge distally with the soleus muscle to form the calcaneal tendon, which attaches to the calcaneus. What actions does the gastrocnemius perform? The gastrocnemius facilitates plantarflexion at the ankle joint and assists in flexing the knee joint. These actions are crucial for movements such as walking, running, and jumping. Which nerve innervates the gastrocnemius muscle? The gastrocnemius is innervated by the tibial nerve. This nerve supplies the muscle, allowing it to perform its functions effectively. What is the blood supply to the gastrocnemius? The gastrocnemius receives its blood supply from the medial and lateral sural arteries, which are branches of the popliteal artery. This vascular supply is essential for the muscle's health and function. Rate This Article