Anatomy, Bony Pelvis and Lower Limb: Extensor Hallucis Longus Muscle

The extensor hallucis longus (EHL) muscle is 1 of 4 muscles in the lower limb's anterior compartment. The 3 other muscles in this region are the tibialis anterior, extensor digitorum longus (EDL), and fibularis tertius. The anterior compartment is innervated by the deep fibular nerve and receives blood from the anterior tibial artery. Muscles in this compartment dorsiflex the ankle and extend the toes. The EHL specifically extends the hallux (big toe), dorsiflexes the foot at the ankle, and inverts the foot. Several conditions can affect the EHL, including foot drop from nerve injury, tendonitis, tendon rupture, and anterior compartment syndrome.