Leg Myology Flashcards
Tibialis Anterior m.
Origin Insertion Action Innervation Blood Supply
Origin: lateral tibial condyle, lateral aspect proximal tibia, and interosseous membrane
Insertion: inferomedial aspect medial cuneiform and base of 1st metatarsal
Action: dorsiflex the foot and the ankle and invert foot
Innervation: deep fibular n.
Blood Supply: anterior tibial a.
Extensor Hallucis Longus m.
Origin Insertion Action Innervation Blood Supply
Origin: anterior aspect fibula and interosseous membrane
Insertion: dorsum of base of 1st distal phalanx
Action: extend hallux, dorsiflex the foot at ankle
Innervation: deep fibular n.
Blood Supply: anterior tibial a.
Extensor Digitorum Longus m.
Origin Insertion Action Innervation Blood Supply
Origin: lateral tibial condyle, medial aspect of fibula and interosseous membrane
Insertion: 2ns-5th middle and sital phalanges
Action: extend digits 2-5 and dorsiflex foot
Innervation: deep fibular n.
Blood Supply: anterior tibial a.
Fibularis (Peroneus) Tertius m.
Origin Insertion Action Innervation Blood Supply
Origin: anterioinferior aspect of fibula and interosseous membrane
Insertion: dorsal aspect base of 5th metatarsal
Action: dorsiflex foot; assist in eversion of foot
Innervation: deep fibular n.
Blood Supply: anterior tibial a, peroneal a.
Fibularis (Peroneus) Longus m.
Origin Insertion Action Innervation Blood Supply
Origin: head and superior aspect of fibula
Insertion: base of 1st metatarsal and medial cuneiform
Action: evert foot; assist in plantarflexion
Innervation: superficial fibular n.
Blood Supply: anterior tibial a, peroneal a.
Fibularis Brevis m.
Origin Insertion Action Innervation Blood Supply
Origin: inferolateral aspect of fibula
Insertion: tuberosity of base of 5th metatarsal
Action: evert foot; assist in plantarflexion
Innervation: superficial fibular n.
Blood Supply: muscular branches of peroneal a.
Gastrocnemuis m.
Origin Insertion Action Innervation Blood Supply
Origin: lateral head- lateral aspect lateral femoral condyle, medial head- popliteal surface above medial femoral condyle
Insertion: poterior calcaneus via calcaneal t.
Action: plantarflexion with extended knee; elevate heel; flex leg
Innervation: tibial n.
Blood Supply: popliteal a.
Soleus m.
Origin Insertion Action Innervation Blood Supply
Origin: posterior aspect head and body of fibula, soleal line
Insertion: posterior calcaneus via calcaneal t.
Action: plantarflexion of the foot at the ankle
Innervation: tibial n.
Blood Supply: posterior tibial a, sural a.
Plantaris m. (Often referred to as “freshman’s nerve” because its long slender tendon is often confused for a nerve by novice anatomy students)
Origin Insertion Action Innervation Blood Supply
Origin: inferior lateral supracondylar line and oblique popliteal l.
Insertion: posterior clacaneus via calcaneal t.
Action: weakly assist in plantarflexion and flex the knee
Innervation: tibial n.
Blood Supply: sural a.
Popliteus m.
Origin Insertion Action Innervation Blood Supply
Origin: lateral aspect of lateral femoral condyle and lateral meniscus
Insertion: posterior aspect tibia superomedial to the soleal line
Action: weakly flex the knee
Innervation: tibial n.
Blood Supply: medial inferior genicular branch of popliteal a, muscular branch of posterior tibial a.
Flexor Hallucis Longus m.
Origin Insertion Action Innervation Blood Supply
Origin: posteroinferior fibula and interosseous membrane
Insertion: base of 1st distal phalanx
Action: flex the hallux, weakly plantarflex the foot at ankle
Innervation: tibial n.
Blood Supply: muscular branch of peroneal a, posterior tibial a.
Tibialis Posterior m.
Origin Insertion Action Innervation Blood Supply
Origin: posterior fibula and tibia inferior to soleal line and interosseous membrane
Insertion: tuberosity of the navicular, medial and intermediate cuneiforms, and bases of 3rd-5th metatarsals
Action: plantarflexion and inversion
Innervation: tibial n.
Blood Supply: muscular branches of sural a, peroneal a, posterior tibial a.
