Muscles Of The Leg Flashcards
Crural facia
Has bony attachments that divide the leg into three compartment
Anterior intermuscular septum
Posterior intermuscular septum
Transverse crural septum
Anterior intermuscular septum
Separates anterior and lateral compartments
Posterior intermuscular septum
Separates lateral and posterior compartment
Transverse crural septum
Separate posterior septum into a superficial and deep layer
Anterior compartment of the leg vessels and muscles
Supplied by anterior tibial artery and deep peroneal nerve
Tibialis anterior
Extensor digitorum longus
Extensor Hallucis longus
Peroneus tertius
Tibialis anterior
O- superior 2/3 lateral surface of tibia
I- medial cuneiform and base of first metatarsal
N- deep peroneal
A- dorsiflexion and inversion of foot
Extensor digitorum longus
O- superior 2/3 of the fibula
I- middle and distal phalanges of the lateral four toes
N- deep peroneal
A- dorsiflexion of the foot and extension of the toes
Extensor Hallicus longus
O- middle 1/3 fibula
I- face of distal phalanx of hallux
N- deep peroneal
A- dorsiflexion of the foot and extension of the hallux
Peroneous tertius
O- distal end of fibula
I- base of the fifth metatarsal
N- deep peroneal
A- dorsiflexion of the foot and eversion of the foot
Extensor digitorum brevis
O- calcaneus
I- long extensor tendon of digits 2-4
N- deep peroneal
A- extension of digits 2-4
Extensor Hallicus brevis
O- calcaneus
I- base of proximal phalanx of hallux
N- deep peroneal
A- extension of the big toe
Lateral compartment of the leg
Supplied by peroneal artery (which is a branch off posterior tibial artery)
And superficial peroneal nerve
Peroneus longus
Peroneus brevis
Peroneus (Fibularis) longus
O- superior 2/3 of the fibula
I- base of the first metatarsal and medial cuneiform
N- superficial peroneal
A- eversion and plantar flexion of the foot
Peroneus (Fibularis) brevis
O- distal end of the fibula
I- base of the fifth metatarsal
N- superficial peroneal
A- eversion and plantar flexion of the foot
Posterior compartment of the leg
Supplied by posterior tibial artery and tibial nerve
Gastrocnemius
Soleus
Plantaris
Flexor digitorum longus
Flexor hallucis longus
Tibialis posterior
Popliteus
Gastrocnemius
O- lateral head from lateral condyle of femur, medial head for medial condyle of femur
I- calcaneus
N- tibial nerve
A- plantar flexion of foot, flexion of knee
Soleus
O- posterior surface of fibula and tibia
I- calcaneus
N- tibial nerve
A- plantar flexion of the foot
Plantaris
O- lateral condyle of femur
I- calcaneus
N- tibial nerve
A- plantar flexion of the foot, flexion of leg
Flexor digitorum longus
O- tibia
I- distal phalanx of lateral four digits
N- tibial nerve
A- flexion of digits 2-5 and plantar flexion of the foot
Flexor hallucis longus
O- fibula
I- distal phalanx a big toe
N- tibial nerve
A- flexion of hallux and plantar flexion of foot
Tibialis posterior
O- tibia, fibula, interosseous membrane
I- navicular, cuneiform, cuboid, base of the second, third and fourth metatarsal
N- tibial nerve
A- inversion and plantar flexion of the foot
Popliteus
O- upper end of tibia
I- lateral condyle of femur
N- tibial nerve
A- rotation of knee joint and knee flexion
Extensor retinaculum of foot
Wraps around the anterior medial and lateral surface of the foot and ankle
Fibular retinaculum
Covers fibularis brevis and longus
Anchors them at the peroneal, tubercle and trochlea of calcaneus
Flexor retinaculum
Allows passageway of all structures into sole of the foot and form roof over tarsal tunnel
