Muscles in the Anterior Compartment of the Leg Flashcards Preview

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Flashcards in Muscles in the Anterior Compartment of the Leg Deck (32):
1

How many muscles are there in the anterior compartment of the leg?

4

2

What are the muscles in the anterior compartment of the leg?

Tibialis anterior
Extensor digitorum longus
Extensor hallucis longus
Fibularis tertius

3

What do the muscles of the anterior compartment of the leg collectively act to do?

Dorsiflex and invert the foot at the ankle joint

4

What muscles extend the toes?

The extensor digitorum longus and extensor hallucis longus

5

What are all the muscles in the anterior compartment of the leg innervated by?

The deep fibular nerve (L4-L5)

6

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

The anterior tibial artery

7

Where is the tibialis anterior muscle located?

Alongside the lateral surface of the tibia

8

How is the action of the tibialis anterior tested?

The patient can be asked to stand on their heels

9

What is the proximal attachment of the tibialis anterior?

Lateral condyle and superior half of lateral surface of tibia and interosseous membrane

10

What is the distal attachment of the tibialis anterior?

Medial and inferior surfaces of medial cuneiform and base of 1st metacarpal

11

What is the main action of the tibialis anterior?

Dorsiflexes ankle
Inverts foot

12

Where does the extensor digitorum longus lie?

Lateral and deep to the tibialis anterior

13

Where can the tendons of the extensor digitorum longus be palpated?

On the dorsal surface of the foot

14

What is the proximal attachment of the extensor digitorum longus?

Lateral condyle of the tibia and superior three quarters of the medial surface of the fibula and interosseous membrane

15

What is the distal attachment of the extensor digitorum longus?

Middle and distal phalanges of lateral four digits

16

What is the main action of the extensor digitorum longus?

Extends lateral four digits
Dorsiflexes ankle

17

Where is the extensor hallicus longus located?

Deep to the EDL and TA

18

What is the proximal attachment of the extensor hallucis longus?

Middle part of anterior surface of fibula and interosseous membrane

19

What is the distal attachment of the extensor hallucis longus?

Dorsal aspect of base of distal phalanx of great toe (hallux)

20

What is the main action of the extensor hallucis longus?

Extends great toe
Dorsiflexes ankle

21

Where does the fibularis tertius muscle arise from?

The most inferior part of the EDL

22

Is the fibularis testis present in all individuals?

Yes

23

What is the proximal attachment of the fibularis tertius?

Inferior third of anterior surface of fibula and interosseous membrane

24

What is the distal attachment of the fibularis tertius?

Dorsum of base of 5th metatarsal

25

What is the main action of the fibularis tertius?

Dorsiflexes ankle
Aids in eversion of foot

26

What is footdrop?

A clinical sign indicating paralysis of the muscles in the anterior compartment of the leg

27

When is footdrop most commonly seen?

When the common fibular nerve is damaged

28

What arises from the common fibular nerve?

The deep fibular nerve

29

What happens in footdrop?

The muscles in the anterior compartment are paralysed, and so the unopposed pull of the plantarflexor muscles (found in the posterior leg) produces pernament plantarflexion

30

What can footdrop interfere with?

Walking

31

Why can footdrop interfere with walking?

The affected limb can drag along the ground

32

How can dragging of the foot with footdrop be circumvented?

The patient can flick the foot outwards while walking, known as an 'eversion flick'.