Which muscles make up the deep posterior compartment of the leg?

The muscles that make up the deep posterior compartment of the leg include tibialis posterior, flexor digitorum longus, flexor hallucis longus, and popliteus. This compartment is crucial for various functions, such as stabilization of the ankle, plantar flexion, and flexion of the toes, which are essential for walking and running.

Tibialis posterior plays a significant role in maintaining the medial arch of the foot and aids in inversion and plantar flexion. Flexor digitorum longus is responsible for flexing the lateral four toes, while flexor hallucis longus focuses on flexing the big toe and contributes to the overall push-off during walking. Popliteus assists in unlocking the knee joint during the initial phases of flexion.

The other choices include muscles from different compartments or groups that do not fit under the definition of the deep posterior compartment, which reinforces the importance of accurately identifying muscle groupings based on their locations and functions.