Muscles in the Lateral Compartment of the Leg Flashcards Preview

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Flashcards in Muscles in the Lateral Compartment of the Leg Deck (15)
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1
Q

What muscles are in the lateral compartment of the leg?

A

Fibularis longus

Fibularis brevis

2
Q

What is the common anatomical function of the muscles in the lateral compartment of the leg?

A

Everts foot
Weakly plantarflexes ankle
Fix the medial margin of the foot during running, and preventing excessive inversion

3
Q

What is eversion?

A

Turning the sole of the foot outwards

4
Q

How much eversion is possible from the anatomical position?

A

Only a few degrees

5
Q

What is the innervation of the muscles in the lateral compartment of the leg?

A

Superficial fibular nerve (L5, S1, S2)

6
Q

What is the arterial supply of the muscles of the lateral compartment of the leg?

A

Fibular artery

7
Q

What is the proximal attachment of the fibularis longus?

A

Head and superior two thirds of lateral surface of fibula

8
Q

What is the course of the fibularis longus?

A

The fibres converge into a tendon, which descends into the foot, posterior to the lateral malleolus. The tendon then crosses under the foot

9
Q

What is the distal attachment of the fibularis longus?

A

Dorsal surface of tuberosity on lateral side of base of 5th metatarsal

10
Q

What does the fibularis longus support?

A

The lateral and transverse arches of the foot

11
Q

How can the common fibular nerve be identified?

A

Using the fibularis longus as an anatomical landmark

12
Q

How can the fibularis longus be used to identify the common fibular nerve?

A

There is a gap between the parts of the fibularis longus that originates from the fibular head and neck. The common fibular nerve passes through this gap

13
Q

What happens to the common fibular nerve after passing through the gap in the fibularis longus?

A

It bifurcates by passing into two terminal branches, the deep and superficial fibular nerve

14
Q

What is the proximal attachment of the fibularis brevis?

A

Inferior two thirds of lateral surface of tibia

15
Q

What is the distal attachment of the fibularis brevis?

A

Dorsal surface of tuberosity on the lateral side of the base of the 5th metatarsal