Muscles of the anterior compament of the leg are innervated primarily by
**Core Concept**
The anterior compartment of the leg contains muscles responsible for dorsiflexion and toe extension, which are essential for balance and locomotion. The innervation of these muscles is crucial for their proper functioning and is determined by the peripheral nervous system.
**Why the Correct Answer is Right**
The muscles of the anterior compartment of the leg, including the tibialis anterior, extensor digitorum longus, and extensor hallucis longus, are primarily innervated by the deep peroneal nerve (also known as the anterior tibial nerve). This nerve is a branch of the common peroneal nerve, which originates from the sciatic nerve. The deep peroneal nerve innervates these muscles through direct motor innervation, allowing for their contraction and resulting in dorsiflexion and toe extension.
**Why Each Wrong Option is Incorrect**
**Option A:** The superficial peroneal nerve, another branch of the common peroneal nerve, primarily innervates the muscles of the lateral compartment of the leg, including the peroneus longus and peroneus brevis. It is not responsible for innervating the muscles of the anterior compartment.
**Option B:** The saphenous nerve, a branch of the femoral nerve, is primarily sensory and does not provide motor innervation to any of the muscles in the anterior compartment of the leg.
**Option C:** The tibial nerve, a branch of the sciatic nerve, primarily innervates the muscles of the posterior compartment of the leg, including the gastrocnemius and soleus. It is not responsible for innervating the muscles of the anterior compartment.
**Clinical Pearl / High-Yield Fact**
The deep peroneal nerve is also responsible for innervating the muscles of the first web space, including the extensor digitorum brevis and the abductor hallucis. Damage to this nerve can result in foot drop and weakness of toe extension.
**Correct Answer:** C. The tibial nerve.