Expected headings
"Origin and insertion"
"The plantaris muscle is one of the calf muscles in the superficial posterior compartment of the leg. It is a long, thin and variably developed muscle that runs from the femur to the Achilles tendon."
"The plantaris muscle arises from the posterosuperior aspect of the lateral femoral condyle, close to the origin of lateral head of gastrocnemius. There is often an attachment to the oblique popliteal ligament. As the plantaris crosses the posterior knee joint, it runs medially."
"In up to 10% of the population, the plantaris is absent; in a smaller number, it may be duplicated 3."