triceps surae

The term "triceps surae" refers to the muscles in the calf of the leg that collectively act as extensors. These muscles are sometimes considered the triceps of the lower leg.1

The primary muscles included in the triceps surae are:
* Gastrocnemius muscle: This is the larger, more superficial muscle of the calf.
* Soleus muscle: Located beneath the gastrocnemius, this is a flat, broad muscle.2

These muscles originate from the tibia and fibula (bones of the lower leg) and attach to the heel via the Achilles tendon. Their main action is to extend the foot downward, which is crucial for movements like walking, running, and jumping.2