4 Lower Leg I,O, A Flashcards
tibialis anterior
origin
Upper 2/3 of tibia
tibialis anterior
insertion
Medial cuneiform & 1st metatarsal
tibialis anterior
action
Dorsiflexion; Inversion
extensor halliucs longus
origin
Middle 2/3 of front of fibula
extensor halliucs longus
insertion
Distal phalanx of great toe
extensor halliucs longus
action
Dorsiflexion; Inversion, Extension of big toe
extensor digitorum longus
origin
Outer condyle of tibia; upper 2/3 fibula
extensor digitorum longus
insertion
Middle & distal phalanges of 4 lateral toes
extensor digitorum longus
action
Dorsiflexion, Eversion, Toe extension (4 lat. toes)
peroneus tertius
origin
Lower 1/3 of fibula
peroneus tertius
insertion
Base of 5th metatarsal
peroneus tertius
action
Dorsiflexion, eversion
anterior compartment
tibialis anterior
extensor hallicus longus
extensor digitorum longus
peroneus tertius
lateral compartment
peroneus brevis
peroneus longus
peroneus longus
origin
Lower 2/3 of fibula
peroneus longus
insertion
Base of 5th metatarsal
peroneus longus
action
Plantarflexion, eversion
peroneus brevis
origin
Head & upper 2/3 of fibula
peroneus brevis
insertion
Medial cuneiform & base of 1st metatarsal
(tendon runs under transverse arch)
peroneus brevis
action
Plantarflexion, Eversion
intrinsic muscles of the foot
do not cross the ankle joint
act as a functional unit
stabilization of foot during propulsion
tibialis posterior
origin
Upper ½ interosseus membrane & adjacent
tibia & fibula
tibialis posterior
insertion
Navicular, cuneiforms, & bases of metatarsals 2,3,4,5
tibialis posterior
action
Plantarflexion, Inversion
flexor digitorum longus
origin
Lower 2/3 posterior surface of tibia
flexor digitorum longus
insertion
Base of phalanx of the 4 lateral toes
flexor digitorum longus
action
Plantarflexion, Inversion, Flexion Toe (4 lat. toes)
flexor hallicus longus
origin
Lower 2/3 posterior surface of fibula
flexor hallicus longus
insertion
Undersurface, base of distal phalanx of big toe
flexor hallicus longus
action
Plantarflexion, Inversion, Flexion big toe
soleus
origin
Upper 2/3 posterior surface of tibia & fibula
soleus
insertion
Calcaneus via Achilles tendon
soleus
action
Plantarflexion
gastrocnemius
origin
Posterior surface of 2 condyles of femur
gastrocnemius
insertion
Calcaneus via Achilles tendon
gastrocneumius
action
Plantarflexion, Flexion of knee
plantaris
origin
Lateral supracondylar line of femur
plantaris
insertion
Calcaneus via Achilles tendon
plantaris
action
Plantarflexion, Flexion of knee
what is plantaris
vestigal, may not be present in all individuals
quadriceps group
rectus femoris,
2 joint muscle at knee and hip
rectus femoris
vastus medialis
vastus lateralis
vastus intermedius
rectus femoris
origin
Anterior-inferior iliac spine
rectus femoris
insertion
Tibial tuberosity via patellar tendon
recuts femoris
action
Knee extension, Hip flexion
vastus medialis
origin
whole length of linea aspera & inner supracondylar ridge
vastus medialis
insertion
Tibial tuberosity via patellar tendon
vastus medialis
action
Knee extension
vastus intermedius
origin
Upper 2/3 of front surface of femur
vastus intermedius
insertion
Tibial tuberosity via patellar tendon
vastus intermedius
action
Knee extension
vastus lateralis
origin
Lateral surface of femur below the greater trochanter
& upper ½ of linea aspera
vastus lateralis
origin
Tibial tuberosity via patellar tendon
vastus lateralis
action
Knee extension
hamstring group
characteristics
all have common origin site
all are two joint muscles
all share the common actions of hip extension and knee flexion
hamstring group
biceps femoris
semimbranous
semitendinousus
biceps femoris
origin
Two heads
(1) ischial tuberosity (2) lower ½ linea aspera and lateral supracondylar ridge
biceps femoris
insertion
Lateral condyle of tibia and head of fibula
biceps femoris
action
Hip extension, Knee flexion, Outward rotation of
hip & knee
semimembranosus
origin
Ischial tuberosity
semimembranosus
insertion
Posterior surface of medial condyle of tibia
semimembranosus
action
Hip extension, Knee flexion, Inward rotation of
hip & knee
semitendinsus
origin
Ischial tuberosity
semitendinsus
insertion
Anterior surface of medial condyle of tibia
medial to tibial tuberosity
semitendinosus
action
Hip extension, Knee flexion, Inward rotation of
hip & knee