Muscles Of Anterior Leg

Question 1

Tibialis anterior

• Origin & insertion?
• Action?
• Innervation?

Answer 1

• Origin: lateral surface of tibia
• Insertion: medial surface of medial cuneiform and 1st metatarsal
• Actions: dorsiflexion and inversion of the foot
• Innervation: deep fibular nerve

Question 2

Extensor digitorum longus

• Origin and insertion?
• Innervation?
• Actions?

Answer 2

• Origin: lateral condyle of tibia and medial surface of fibula
• Insertion: converge into a tendon which splits into four, each inserts onto a toe
• Actions: dorsiflexion of foot, extension of lateral four toes
• Innervation: deep fibular nerve