Muscle
Tibialis anterior
Chief dorsiflexor
High-yield
Prime dorsiflexor and invertor; deep fibular nerve. Weakness causes foot drop.
Overview
The main muscle of the anterior leg compartment, dorsiflexing and inverting the foot and clearing the toes during swing.
Reference facts
- Origin
Lateral condyle and proximal lateral surface of the tibia and interosseous membrane
- Insertion
Medial cuneiform and base of the 1st metatarsal
- Action
Dorsiflexes the ankle and inverts the foot
- Innervation
Deep fibular (peroneal) nerve (L4, L5)
- Blood supply
Anterior tibial artery
Clinical correlation
Deep fibular nerve or L4/L5 lesion → foot drop and steppage gait.