muscles of the leg Flashcards
Compartments of the leg + functions of their muscles
Anterior — extensors
Posterior — flexors
Lateral — eversors
The muscles in the anterior compartment of the leg are innervated by the…
Deep fibular nerve
Muscles of the anterior compartment of the leg
Tibialis anterior, extensor digitorum longus, extensor hallucis longus + fibularis tertius
Site of origin, trajectory + insertion of tibialis anterior
Origin: anterolateral portion of the proximal tibia
Trajectory: inferomedial, passes in front of the medial malleolus
Insertion: inferomedial portion of the medial cuneiform bone
Site of origin + insertion of extensor digitorum longus
Origin: anterior portion of the fibula
Insertion: phalanges of the 2. to 5. toes
Function of tibialis anterior
Dorsiflexion (extension of the ankle)
Function of extensor digitorum longus
Extension of the 2. to 5. toes
Site of origin + insertion of extensor hallucis longus
Origin: anterior surface of the fibula (more distally than EDL)
Trajectory: moves inferomedially
Insertion: phalanx of the 1. toe
Function of extensor hallucis longus
Extension of the big toe
Site of origin + insertion of fibularis tertius
Origin: anterior portion of the fibula (partially separated from the EDL)
Trajectory: moves inferolaterally, towards the 5th toe
Insertion: base of the 5th metatarsal
The fibularis longus muscle originates in…
The proximolateral portion of the fibula
Trajectory of the fibularis longus
Moves down towards the lateral maleolus, passes through the superior + inferior fibular retinaculi, inserts into an inferior groove in the cuboid bone + crosses over to the first metatarsal
Site of insertion of the fibularis longus
Base of the 1. metatarsal
The muscles in the lateral compartment of the leg are innervated by the…
Superficial fibular nerve
The fibularis brevis originates in…
The lateral portion of the fibula, but lore distallly than the FL does