muscles of leg Flashcards
Tibialis anterior
P = lateral condyle and superior half of lateral surface of tibia and interosseous membrane
D = Medial and inferior surfaces of medial cuneiform and base of 1st metatarsal
N = deep fibular (peroneal) nerve
A = Dorsiflexes ankle and +/- inverts foot (depends on where tendon pulls relative to axis of subtalar joint)
Extendor Digitorum longus
P = Lateral condyle of tibia and superior threequarters of medial surface of the fibula and interosseous membrane
D = Middle and distal phalanges of lateral four digits
N = Deep fibular
A = Extends lateral four digits and dorsiflexes ankle
Extensor Hallucis longus
P = Middle part of anterior surface of fibula and interosseous membrane
D = Dorsal aspect of base of distal phalanx of great toe
N = Deep fibular (peroneal) nerve
A = Extends great toe and dorsiflexes ankle
Fibularis (peroneus) Tertius
P = Inferior third of anterior surface of fibula and interosseous membrane
D = Dorsum fo base of 5th metatarsal
N = Deep fibular (peroneal) nerve (L5, S1)
Fibularis Longus
P = Head and superior 2/3 of lateral surface of fibula
D = Base of 1st metatarsal and medial cuneiform
N = Superficial fibular (peroneal) nerve)
A = Everts foot and plantarflexes 1st ray; weakly plantarflexes ankle
Fibularis Brevis
P = Inferior 2/3 of lateral surface of fibula
D = Dorsal surface of tuberosity on lateral side of base of 5th metatarsal
N = Superficial fibular (peroneal) nerve
A = Everts foot and plantarflexes, weakly plantarflexes ankle
Gastrocnemius
P = Lateral head: lateral aspect of femoral condyle; Medial head: popliteal surface of femur (superior to medial condyle)
D = Posterior surface of calcaneus via calcaneal tendon
N = Tibial nerve (S1 and S2)
A = plantaflexes ankle with knee extended, raises heel during walking and flexes leg at knee joint
Soleus
P = Posterior aspect fibular head, superior ¼ of posterior surface of fibula soleal line and medial border of tibia
D = Posterior surface of calcaneus via calcaneal tendon
N = Tibial nerve (S1 and S2)
A = Plantarflexes ankle independent of knee position and steadies leg on foot
Plantaris
P = Inferior end of lateral supracondylar line of femur and oblique popliteal ligament
D = Posterior surface of calcaneus via calcaneal tendon
N = Tibial nerve (S1 and S2)
A = Weakly assists gastronemius in PF ankle and flexing knee
Popliteus
P = Lateral surface o lateral condyle of femur and lateral meniscus
D = Posterior surface of tibia, superior to soleal line
N = Tibial N.
A = Weakly flexes knee and unlocks it; in NWB it medially rotates tibia on femur; in WB it laterally rotates femur on tibia
Flexor Hallucis Longus
P = Inferior 2/3 of posterior surface of fibula and inferior part of interosseous membrane
D = Base of distal phalanx of great toe
N = Tibial N. (S2, S3)
A = Flexes great toe at all joints and weakly plantarflexes ankle; supports medial longitudinal arches of foot
Flexor Digitorum longus
P = Medial part of posterior surface of tibia inferior to soleal line and by a broad tendon to fibula
D = Bases of distal phalanges of lateral four digits
N = Tibial N. (S2, S3)
A = Flexes lateral four digits and plantarflexes ankle; supports longitudinal arches of foot
Tibialis Posterior
P = Interosseous membrane, posterior surface of tibia inferior to soleal line, and posterior surface of fibula
D = Tuberosity of navicular, cuneiform, and cuboid and bases of 2nd, 3rd, 4th metatarsals
N = Tibial nerve
A = plantarflexes ankle and inverts (supinates) foot
Nerve & blood supply of anterior compartment
deep fibular nerve
anterior tibial artery
nerve and blood supply of posterior compartment
tibial nerve, sural nerve
posterior tibial artery, fibular artery
