Anterior leg Flashcards
Neurovascular supply of anterior leg
Deep fibular nerve (L4-L5)
Anterior tibial artery
How can you test the power of tibialis anterior muscle
Why
Ask patient to stand on heels
It’s the strongest dorsiflexor of foot
Origin of tibialis anterior
Lateral tibia
Insertion of tibialis anterior
Medial cuneiform and base of metatarsal 1
Action of tibialis anterior
Dorsiflexion and inversion of foot
Origin of extensor digitorum longus
Lateral condyle of tibia
Medial surface of fibula
Insertion of extensor digitorum longus
Tendon splits into 4 each inserting onto a toe
Action of extensor digitorum longus
Extension of lateral 4 toes
Dorsiflexion of foot
Origin of extensor hallucis longus
Medial fibular shaft
Where does the tendon of extensor hallucis longus cross at ankle
Anterior to ankle joint
Insertion of extensor hallucis longus
Base of distal phalanx of big toe
Action of extensor hallucis longus
Extension of big toe
Dorsiflexion of foot
What can fibularis tertius be considered as being a part of
Extensor digitorum longus
Which anterior leg muscle is not present in everyone
Fibularis tertius
Origin of fibularis tertius
Medial surface of fibula
Insertion of fibularis tertius
Metatarsal 5
Action of fibularis tertius
Eversion and dorsiflexion of foot
Consequence of damage to common fibular nerve
Why does this occur
Paralysis of anterior leg muscles
Footdrop
Unopposed pull of plantarflexors in posterior leg
How does footdrop affect walking
Affected limb can drag along ground
To compensate, the patient can flick affected foot outwards while walking (eversion flick)
Muscles of anterior leg
Tibialis anterior
Extensor digitorum longus
Extensor hallucis longus
Fibularis tertius
