Leg Muscles Flashcards
muscles of anterior compartment of leg
tibialis anterior
extensor hallucis longus
entensor digitorum ongus
peroneus tertius
tibialis anterior
-origin
lateral condyle of tibia
superior 1/2 of lateral tibia
tibialis anterior
-insertion
medial and inferior surface of
- medial cuneiform
- 1st metatarsal
tibialis anterior
-actions
foot dorsiflexion
foot inversion
supports the medial longitudinal arch
tibialis anterior
-innervation
deep fibular nerve (L4, L5)
extensor hallucis longus
-origin
middle part of anterior surface of fibula
interosseus membrane
extensor hallucis longus
-insertion
dorsal aspect of base of distal phalanx of hallux
extensor hallucis longus
-actions
hallux extension
foot dorsiflexion
extensor hallucis longus
-innervation
deep fibular (L4, L5)
entensor digitorum longus
-origin
lateral condyle of tibia
superior 3/4 of anterior surface of fibula
interosseus membrane
entensor digitorum longus
-insertion
middle and distal phalanges of lateral 4 digits
entensor digitorum longus
-actions
extends lateral 4 digits
dorsiflexes foot
entensor digitorum longus
-innervation
deep fibular (L4, L5)
peroneus (fibular) tertius
-origin
inferior 1/3 of anterior surface of fibula
interosseus membrane
peroneus (fibular) tertius
-insertion
dorsum of base of 5th metatarsal
peroneus (fibular) tertius
-actions
foot dorsiflexion
aids in foot eversion
peroneus (fibular) tertius
-innervation
deep fibular (L4, L5)
muscle of lateral compartment of leg
peroneus longus
peroneus brevis
peroneus (fibular) longus
-origin
head and superior 2/3 of lateral surface of fibula
peroneus (fibular) longus
-insertion
base of first metatarsal
medial cuneiform
peroneus (fibular) longus
-actions
foot eversion weak foot plantarflexion tendon supports -transverse arch -medial longitudinal arch -lateral longitudinal arch
peroneus (fibular) longus
-innervation
superficial fibular (L5, S1, S2)
peroneus brevis
-origin
inferior 2/3 of lateral surface of fibula
peroneus brevis
-insertion
dorsal surface of tuberosity on lateral side of base of 5th metatarsal
peroneus brevis
-actions
foot eversion
weak plantarflexion
peroneus brevis
-innervation
superficial fibular nerve (L5, S1, S2)
muscles of the superficial posterior compartment of the leg
gastrocnemius
soleus
plantaris
gastrocnemius
-origin
lateral head
-lateral aspect of lateral condyle of femur
medial head
-popliteal surface of femur, superior to medial condyle
gastrocnemius
-insertion
posterior surface of calcaneus via tendo calcaneus
gastrocnemius
-actions
plantar flexes foot
raises heel during walking
flexes knee
gastrocnemius
-innervation
tibial nerve (S1, S2)
soleus
-origin
posterior aspect of head of fibula
superior 1/4 of fibula
soleal line
medial border of tibia
soleus
-insertion
posterior surface of calcaneus via tendo calcaneus
soleus
-actions
plantar flexes foot
raises heel during walking
soleus
-innervation
tibial nerve (S1, S2)
plantaris
-origin
inferior end of lateral supracondylar line of femur
oblique popliteal ligament
plantaris
-insertion
fuses with tendo calcaneus
plantaris
-action
weakly assists in plantarflexion and flexion of knee
plantaris
-innervation
tibial nerve (S1, S2)
muscles of the deep posterior compartment of the leg
popliteus
flexor hallucis longus
flexor digitorum longus
tibialis posterior
popliteus
-origin
lateral surface of lateral condyle of femur and lateral meniscus
popliteus
-insertion
posterior surface of tibia superior to soleal line
popliteus
-actions
weakly flexes knee
unlocks knee
-rotates femur laterally on fixed tibia
-rotates tibia medially on fixed femur
popliteus
-innervation
tibial nerve (L4, L5, S1)
flexor hallucis longus
-origin
inferior 2/3 of posterior surface of fibula
inferior part of interosseus membrane
flexor hallucis longus
-insertion
base of distal phalanx of hallux
flexor hallucis longus
-action
flexes hallux at all joints
plantar flexes foot
supports longitudinal arch of foot
flexor hallucis longus
-innervation
tibial nerve (S2, S3)
flexor digitorum longus
-origin
medial part of posterior surface of tibia inferior to soleal line
to fibula via broad aponeurosis
flexor digitorum longus
-insertion
bases of distal phalanges of lateral 4 digits
flexor digitorum longus
-actions
flexes lateral 4 digits
plantarflexes foot
suports medial longitudinal arch of foot
flexor digitorum longus
-innervation
tibial nerve (S2, S3)
tibialis posterior
-origin
interosseus membrane
posterior surface o tibia inferior to soleal line
posterior surface of fibula
tibialis posterior
-insertion
tuberosity of navicular
all three cuneiform bones (and cuboid bone?)
bases of 2nd, 3rd, 4th metatarsals
tibialis posterior
-actions
plantarflexes foot inverts foot supports -transverse arch -medial longitudinal arch
tibialis posterior
-innervation
tibial nerve (L4, L5)
muscles that support medial longitudinal arch
tibialis anterior peroneus longus flexor hallucis longus flexor digitorum longus tibialis posterior
muscles that support lateral longitudinal arch
peroneus longus
flexor hallucis longus?
muscles that support transverse longitudinal arch
peroneus longus
tibialis posterior
