Muscles in the Anterior Compartment of the Leg Flashcards Preview

ESA 2- Musculoskeletal System > Muscles in the Anterior Compartment of the Leg > Flashcards

Flashcards in Muscles in the Anterior Compartment of the Leg Deck (24)
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1
Q

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

A

4

2
Q

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

A

Tibialis anterior
Extensor digitorum longus
Extensor hallucis longus
Fibularis tertius

3
Q

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

A

Dorsiflex and invert the foot at the ankle joint

4
Q

What muscles extend the toes?

A

The extensor digitorum longus and extensor hallucis longus

5
Q

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

A

The deep fibular nerve (L4-L5)

6
Q

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

A

The anterior tibial artery

7
Q

Where is the tibialis anterior muscle located?

A

Alongside the lateral surface of the tibia

8
Q

How is the action of the tibialis anterior tested?

A

The patient can be asked to stand on their heels

9
Q

What is the main action of the tibialis anterior?

A

Dorsiflexes ankle

Inverts foot

10
Q

Where does the extensor digitorum longus lie?

A

Lateral and deep to the tibialis anterior

11
Q

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

A

On the dorsal surface of the foot

12
Q

What is the main action of the extensor digitorum longus?

A

Extends lateral four digits

Dorsiflexes ankle

13
Q

Where is the extensor hallicus longus located?

A

Deep to the EDL and TA

14
Q

What is the main action of the extensor hallucis longus?

A

Extends great toe

Dorsiflexes ankle

15
Q

Where does the fibularis tertius muscle arise from?

A

The most inferior part of the EDL

16
Q

Is the fibularis testis present in all individuals?

A

Yes

17
Q

What is the main action of the fibularis tertius?

A

Dorsiflexes ankle

Aids in eversion of foot

18
Q

What is footdrop?

A

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

19
Q

When is footdrop most commonly seen?

A

When the common fibular nerve is damaged

20
Q

What arises from the common fibular nerve?

A

The deep fibular nerve

21
Q

What happens in footdrop?

A

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

22
Q

What can footdrop interfere with?

A

Walking

23
Q

Why can footdrop interfere with walking?

A

The affected limb can drag along the ground

24
Q

How can dragging of the foot with footdrop be circumvented?

A

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