Tibialis Anterior
The tibialis anterior is the most superficial muscle of the anterior compartment of the leg. It is the primary dorsiflexor of the ankle and inverts the foot, crucial for the swing phase of walking.
Origin, Insertion, Action, Innervation
OOrigin
Lateral condyle and upper two-thirds of lateral surface of tibia, interosseous membrane
IInsertion
Medial cuneiform bone and base of first metatarsal
AAction
- • Dorsiflexion of the ankle
- • Inversion of the foot
NInnervation
Deep fibular (peroneal) nerve (L4, L5)
Blood Supply
Anterior tibial artery
Clinical Relevance
Foot drop (inability to dorsiflex) occurs with deep fibular nerve injury or L4/L5 radiculopathy. The tibialis anterior is tested during neurological examination. Shin splints may involve this muscle. Its tendon is visible during dorsiflexion.
Palpation
Easily palpated on the anterolateral leg. Have the patient dorsiflex the foot against resistance to feel the muscle and see its tendon.
Study Tips
- ✓Anterior compartment = dorsiflexors (opposite of calf muscles)
- ✓Deep fibular nerve - same nerve for all anterior compartment muscles
- ✓Tibialis anterior = dorsiflex + invert; fibularis (peroneus) muscles = evert
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Common questions about the tibialis anterior
Foot drop is the inability to dorsiflex the ankle, causing the foot to drag during walking. It can result from deep fibular (peroneal) nerve injury, L4/L5 radiculopathy, or anterior compartment muscle weakness.
The tibialis anterior is innervated by the deep fibular (peroneal) nerve, which carries fibers from the L4 and L5 nerve roots. This nerve innervates all muscles of the anterior compartment of the leg.
Dorsiflexion is pointing the toes upward toward the shin (tibialis anterior). Plantarflexion is pointing the toes downward, like standing on tiptoes (gastrocnemius and soleus).
Shin splints (medial tibial stress syndrome) cause pain along the medial tibia, often from overuse. While it typically involves the tibialis posterior, the tibialis anterior can also be affected, especially with excessive dorsiflexion activities.