Anterior Leg

Question 1

Fibularis tertius

Answer 1

Origin: Medial surface of tibia & adjacent interosseous membrane
Insertion: Dorsal aspect of base of 5th metatarsal
Action: Ankle dorsiflexion. Assists in foot eversion
Innervation: Deep fibular n.

Question 2

Tibialis anterior

Answer 2

Origin: Lateral condyle & proximal 1/2 of lateral surface of tibia + adjacent interosseous membrane
Insertion: Inferomedial aspect of medial cuneiform & base of 1st metatarsal
Action: Ankle dorsiflexion, foot inversion
Innervation: Deep fibular n.

Question 3

Extensor digitorum longus

Answer 3

Origin: Lateral condyle of tibia, proximal 3/4 of fibula + adjacent interosseous membrane
Insertion: Dorsal aspect of bases of middle & distal phalanges of digits 2-5
Action: Ankle dorsiflexion, extension of digits 2-5
Innervation: Deep fibular n.

Question 4

Extensor hallucis longus

Answer 4

Origin: Medial surface of fibula & adjacent interosseous membrane
Insertion: Dorsal aspect of base of distal phalanx of big toe
Action: Big toe extension, ankle dorsiflexion
Innervation: Deep fibular n.