MOINA Muscles of the Posterior Fascial Compartment of the Leg Flashcards
gastrocnemius
origin: lateral condyle of femur (lateral head) and above medial condyle of femur (medial head)
insertion: via tendo calcaneus into posterior surface of calcaneum
nerve: tibial nerve
plantar flexes foot at ankle joint; flexes leg at knee joint
plantaris
origin: lateral supracondylar ridge of femur
insertion: posterior surface of calcaneus
nerve: tibial nerve
plantar flexes foot at ankle joint; flexes leg at knee joint
soleus
origin: shafts of tibia and fibula
insertion: via tendo calcaneus into posterior surface of calcaneum
nerve: tibial nerve
together with gastrocnemius and plantaris is a power plantar flexor of the foot; provides main propulsive force in walking and running
popliteus
origin: lateral surface of lateral condyle of femur
insertion: posterior surface of shaft of tibia above soleal line
nerve: tibial nerve
flexes leg at knee joint; unlocks knee joint by lateral rotation of femur on tibia and slackens ligaments of joint
flexor digitorum longus
origin: posterior surface of shaft of tibia
insertion: bases of distal phalanges of lateral four toes
nerve: tibial nerve
flexes distal phalanges of lateral four toes; plantar flexes foot at ankle joint; supports medial and lateral longitudinal arches of the foot
flexor hallucis longus
origin: posterior surface of shaft of fibula
insertion: base of distal phalanx of big toe
nerve: tibial nerve
flexes distal phalanx of big toe; plantar flexes foot at ankle joint; supports medial longitudinal arch of the foot
tibialis posterior
origin: posterior surface of shafts of tibia and fibula
insertion: tuberosity of navicular and other neighboring bones
nerve: tibial nerve
plantar flexes foot at ankle joint; inverts foot at subtalar and transverse tarsal joints; supports medial longitudinal arch of the foot