Anterior compartment of leg contains all except –
**Core Concept**
The anterior compartment of the leg is a fascial space that contains muscles responsible for dorsiflexion and inversion of the foot. It is bounded by the deep fascia of the leg, the tibia, and the fibula.
**Why the Correct Answer is Right**
The anterior compartment of the leg primarily contains muscles that contribute to dorsiflexion and inversion of the foot. The muscles in this compartment include the tibialis anterior, extensor hallucis longus, extensor digitorum longus, and peroneus tertius. These muscles are innervated by the deep peroneal nerve and work together to facilitate ankle movement.
**Why Each Wrong Option is Incorrect**
**Option A:** This muscle is actually found in the posterior compartment of the leg, where it assists in plantarflexion and inversion.
**Option B:** This muscle is also found in the posterior compartment of the leg, where it assists in plantarflexion and inversion.
**Option C:** This muscle is found in the lateral compartment of the leg, where it assists in eversion and ankle stabilization.
**Clinical Pearl / High-Yield Fact**
The anterior compartment of the leg is a common site for compartment syndrome, which can occur due to increased pressure within the fascial space, leading to muscle and nerve damage.
**Correct Answer: A. Tibialis posterior.**