Muscle
Tibialis anterior
Anterior leg muscle lifting and turning the foot inward
High-yield
Its combined actions are ankle dorsiflexion and foot inversion. Reduced dorsiflexor function can make toe clearance difficult, but weakness does not by itself identify where a nerve or muscle problem lies.
Overview
Tibialis anterior runs beside the tibia and sends a tendon across the front of the ankle to the medial foot. It raises the forefoot during walking and helps control its lowering after the heel reaches the ground.
Reference facts
- Origin
- Lateral tibial condyle and proximal lateral tibial shaft, with interosseous membrane and neighboring fascial attachments
- Insertion
- Medial cuneiform and base of the first metatarsal, with variation in the tendon slips
- Action
- Dorsiflexes the ankle and inverts the foot; helps control forefoot lowering during gait
- Innervation
- Deep fibular nerve, with L4-L5 commonly emphasized for ankle dorsiflexion
- Blood supply
- Muscular branches of the anterior tibial artery
Clinical correlation
Foot drop may result from injury affecting the fibular nerve pathway, lumbar nerve roots or the muscle-tendon unit. Other neurological causes are possible, so a high-stepping gait is a functional clue rather than a diagnosis.
Frequently asked questions
What does the tibialis anterior do?
Dorsiflexes the ankle and inverts the foot; helps control forefoot lowering during gait.
What nerve innervates the tibialis anterior?
Deep fibular nerve, with L4-L5 commonly emphasized for ankle dorsiflexion.
Where does the tibialis anterior attach?
Origin: Lateral tibial condyle and proximal lateral tibial shaft, with interosseous membrane and neighboring fascial attachments. Insertion: Medial cuneiform and base of the first metatarsal, with variation in the tendon slips.
What is the blood supply of the tibialis anterior?
The tibialis anterior is supplied by the muscular branches of the anterior tibial artery.