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
nerve and blood supply of lateral compartment
superficial fibular nerve
NO ARTERY–> superiorly and inferiorly perforating branches of peroneal artery
