MSK - Muscles of the Lateral Compartment of the Leg Flashcards Preview

ESA 2 > MSK - Muscles of the Lateral Compartment of the Leg > Flashcards

Flashcards in MSK - Muscles of the Lateral Compartment of the Leg Deck (11):
1

What are the two muscles of the lateral compartment of the leg?

- Fibularis longus

- Fibularis brevis

2

What is the overall action of the lateral muscles?

- Eversion of the foot

- Fix the medial margin during running

- Prevents excessive eversion

3

What is the origin of the fibularis longus?

- Superior and lateral surface of the tibia

- Lateral tibial condyle

4

Where does fibularis longus insert?

- Medial bones of the foot (mainly medial cuneiform and base of metatarsal 1)

- After fibres converge into a tendon which descends into the tendon posteriorly to the lateral malleolus

- Crosses under the foot

5

What are the actions of the fibularis longus?

- Eversion of the foot

- Plantarflexion of the foot

- Supports the lateral and transverse arches of the foot

6

What is the origin of fibularis brevis?

Inferior and lateral surface of the fibular shaft

7

Where does fibularis brevis insert?

- A tubercule on metatarsal 5

- Belly forms a tendon and descends with fibularis longus tendon

- Goes into the foot posteriorly to the lateral malleolus

- Passes over calcaneus and cuboidal bones

8

What are the actions of fibularis brevis?

Eversion of the foot

9

What is the innervation of fibularis longus and brevis?

Superficial fibular (peroneal) nerve (L4 - S1)

10

What is the arterial supply of fibularis longus and brevis?

Fibular/peroneal artery

11

How can the common fibular nerve be identified?

- Using fibularis longus

- Gap between parts of the FL originating from the fibular head and neck

- Nerve passes through the gap and bifurcates to form deep and superficial fibular nerves

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