MSK - Muscles of the Anterior Compartment of the Lower Leg Flashcards Preview

ESA 2 > MSK - Muscles of the Anterior Compartment of the Lower Leg > Flashcards

Flashcards in MSK - Muscles of the Anterior Compartment of the Lower Leg Deck (23):
1

What are the four muscles of the anterior leg?

- Tibialis anterior

- Extensor digitorum longus

- Extensor hallucis longus

- Fibularis tertius

2

What are the collective actions of the anterior leg muscles?

- Dorsiflexion of the foot at the ankle

- Inversion of the foot at the ankle

3

What are the extra movements of the extensor digitorum longus and extensor hallucis longus?

Extension of the toes

4

What is the innervation of all the muscles in the anterior leg?

Deep fibular nerve (L4-L5)

5

What is the arterial supply of all the muscles in the anterior leg?

The anterior tibial artery

6

What is the origin of tibialis anterior?

The lateral surface of the tibia

7

Where does tibialis anterior insert?

- Medial cuneiform

- Base of metatarsal 1

8

What are the actions of tibialis anterior?

- Dorsiflexion of the foot

- Inversion of the foot

9

How can the power of tibialis anterior be tested?

- Ask patient to stand on their heels

- (Tibialis anterior is the strongest dorsiflexor)

10

What is the origin of extensor digitorum longus?

- Lateral condyle of the tibia

- Medial surface of the fibula

11

Where does extensor digitorum longus insert?

- Fibres converge into a tendon which goes to the dorsal surface of the foot

- Tendon splits into four for one insertion per toe

12

What are the actions of extensor digitorum longus?

- Extension of the lateral four toes

- Dorsiflexion of the foot

13

Where can the extensor digitorum longus tendons be palpated?

Dorsal surface of the foot

14

Where is the extensor hallucis longus?

Deep to the extensor digitorum longus and tibialis anterior

15

What is the origin of extensor hallucis longus?

Medial surface of the fibular shaft

16

Where does extensor hallucis longus insert?

- Base of the distal phalanx of the big toe (after the tendon crosses the ankle anteriorly)

17

What is the action of extensor hallucis longus?

- Extension of the big toe

- Dorsiflexion of the foot

18

What is the origin of fibularis tertius?

- Medial surface of the fibula (with extensor digitorum longus)

19

Where does fibularis tertius insert?

- Metatarsal 5 after forming a tendon at the dorsal surface of the foot

- Descends with the EDL

20

What are the actions of fibularis tertius?

- Eversion of the foot

- Dorsiflexion of the foot

21

What is footdrop?

- Indicator of paralysis to anterior muscles

- Most commonly due to common fibular nerve damage

22

How does footdrop manifest?

Permanent plantarflexion due to unopposed plantarflexor muscles

23

How can footdrop affect a patient?

- Interferes with walking as affected limb can drag on the ground

- Tries to cancel out by flicking the foot outwards (eversion flick)

Decks in ESA 2 Class (63):