Surae is a Latin word meaning the calf of the leg or the fleshy portion between the ankle and the knee. There are several synonyms for this term, including gastrocnemius muscle, calf muscle, posterior muscle group, and leg muscles. Gastrocnemius muscle is the most common medical term used by healthcare professionals to refer to the surae muscle due to the muscle's role in plantarflexion and knee flexion. Calf muscle is a general term used by fitness enthusiasts and athletes to describe the entire group of muscles located in the leg. Posterior muscle group and leg muscles are broader descriptions used by anatomy students to group various types of muscles located in the posterior leg region.