The posterior compartment refers to a specific area in the body, particularly in the limbs, that contains muscles and structures responsible for certain movements. In the context of the arm, it includes muscles like the triceps brachii, which help extend the elbow. In the leg, it contains muscles such as the gastrocnemius and soleus, which are crucial for actions like walking and running. This compartment is separated from other compartments by connective tissue and fascia, which helps organize the muscles and nerves. The posterior compartment is supplied by specific blood vessels and nerves, such as the radial nerve in the arm and the tibial nerve in the leg, ensuring proper function and movement.