Extensors Of The Ankle And Toes

Question 1

Give action, origin, insertion and nerve innervation for tibialis anterior

Answer 1

A
Invert the foot
Dorsiflex the ankle (talocrural joint)
O
Lateral condyle of tibia; proximal, lateral surface of tibia; and interosseous membrane
I
Medial cuneiform and base of the first metatarsal
N
Deep fibular L4, 5, S1

Question 2

Give action, origin, insertion and nerve innervation for extensor digitorum longus

Answer 2

A
Extend the second through fifth toes (metatarsophalangeal and interphalangeal joints) Dorsiflex the ankle (talocrural joint)
Evert the foot
O
Lateral condyle of tibia; proximal, anterior shaft of fibula; and interosseous membrane
I
Middle and distal phalanges of second through fifth toes
N
Deep fibular L4, 5, S1

Question 3

Give action, origin, insertion and nerve innervation for extensor hallicus longus

Answer 3

A
Extend the first toe (metatarsophalangeal and interphalangeal joints)
Dorsiflex the ankle (talocrural joint)
Invert the foot
O
Middle, anterior surface of fibula and interosseous membrane
I
Distal phalanx of first toe
N
Deep fibular L4, 5, S1