Muscles in the Lateral Compartment of the Leg Flashcards
What muscles are in the lateral compartment of the leg?
Fibularis longus
Fibularis brevis
What is the common anatomical function of the muscles in the lateral compartment of the leg?
Everts foot
Weakly plantarflexes ankle
Fix the medial margin of the foot during running, and preventing excessive inversion
What is eversion?
Turning the sole of the foot outwards
How much eversion is possible from the anatomical position?
Only a few degrees
What is the innervation of the muscles in the lateral compartment of the leg?
Superficial fibular nerve (L5, S1, S2)
What is the arterial supply of the muscles of the lateral compartment of the leg?
Fibular artery
What is the proximal attachment of the fibularis longus?
Head and superior two thirds of lateral surface of fibula
What is the course of the fibularis longus?
The fibres converge into a tendon, which descends into the foot, posterior to the lateral malleolus. The tendon then crosses under the foot
What is the distal attachment of the fibularis longus?
Dorsal surface of tuberosity on lateral side of base of 5th metatarsal
What does the fibularis longus support?
The lateral and transverse arches of the foot
How can the common fibular nerve be identified?
Using the fibularis longus as an anatomical landmark
How can the fibularis longus be used to identify the common fibular nerve?
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
What happens to the common fibular nerve after passing through the gap in the fibularis longus?
It bifurcates by passing into two terminal branches, the deep and superficial fibular nerve
What is the proximal attachment of the fibularis brevis?
Inferior two thirds of lateral surface of tibia
What is the distal attachment of the fibularis brevis?
Dorsal surface of tuberosity on the lateral side of the base of the 5th metatarsal
