Posterior Leg Flashcards
Gastrocnemius - superior
crosses the knee
LAT head O: lat aspect of lat condyle of femur
Med head O: popliteal surface of femur, superior to medial condyle
I: posterior surface of calcaneus via Achilles tendon
Plantaris
crosses the knee
O: inferior end of lat supracondylar line of femur, popliteal lig
I: posterior surface of calcaneus via Achilles tendon
Soleus
O: Posterior aspect of head of fibula, superior 1/4 of posterior surface of fibula soleal line
I: posterior surface of calcaneus via Achilles tendon
Popliteus - deep
O: Lateral surface of lat femoral condyle and lat meniscus
I: posterior surface of tibia, superior to soleal line
Flexor Digitorum Longus - deep
more superficial
O: Medial part of posterior surface of tibia inferior to soleal line
I: Base of distal phalanx of four lateral digits
From MEDIAL TO LATERAL (digits)
Flexor Hallucis Longus - deep
deeper
‘beef of the heel’
O: Inferior part of posterior surface of fibula and interosseus membrane
I: Base of distal phalanx of great toe (hallus)
From LATERAL to MEDIAL (Big toe)
Tibialis Posterior - deep
deepest
GREEDY
O: Interosseis membrane, post surface of tibia inferior to soleal line, posterior surface of fibula
GREEDY - across both bones and the membrane
I: Tuberosity of navicular, cuneiforms, cuboid, sustentaculum tali and bases of 2nd, 3rd and 4th mets
Gastrocnemius ACTION
PF ankle when knee is EXTENDED
raises heel during walking
flexes leg at knee joint
EXPLOSIVE POWER - fatigues quickly
Plantaris ACTION
Weakly assists gastroc in PF ankle
Soleus ACTION
PF ankle independent of knee position
steadies leg on foot
stand and stroll - main antigravity muscle (hold upright into PF at the ankle)
doesnt fatigue - endurance
Popliteus ACTION
Weakly flexes knee and unlocks it by rotating femur 5 degrees on fixed tibia
medially rotates tibia of unplanted limb
FDL Action
Flexes digits at all joints
Weakly PF the ankle
supports medial longitudinal arch of the foot
FHL Action
Flexes big toe at all joints
Weakly PF the ankle
supports medial longitudinal arch of the foot
Tibialis Posterior ACTION
PF ankle inverts foot (supernates)
INNERVATION of the Posterior Compartment
Tibial Nerve!
