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Anatomy Muscles 150-175


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Extensor Digitorum Brevis innervation
Deep peroneal nerve
Flexor Hallucis Longus origin and insertion
origin: Middle part of shaft of fibula; interosseous membrane; insertion: Tendon runs under foot to distal phalanx of great toe
Tibialis Posterior action
Prime mover of foot inversion; plantar flexes ankle; stabilizes medial longitudinal arch of foot (as during ice skating)
Tibialis Posterior innervation
Tibial nerve
Flexor Digitorum Longus origin and insertion
origin: Posterior tibia; insertion: Tendon runs behind medial malleolus and splits to insert into distal phalanges of toes 2-5
Flexor Hallucis Longus action
Plantar flexes and inverts foot; flexes great toe at all joints; “push off” muscle during walking
Flexor Hallucis Longus innervation
Tibial nerve
Popliteus origin and insertion
origin: Lateral condyle of femur; insertion: Proximal tibia
Flexor Digitorum Longus action
Plantar flexes and inverts foot; flexes toes; helps foot “grip” ground
Flexor Digitorum Longus innervation
Tibial nerve
Plantaris origin and insertion
origin: Posterior femur above lateral condyle; insertion: Via a long, thin tendon into calcaneus or calcaneal tendon
Popliteus action
Flexes and rotates leg medially to unlock knee from full extension when flexion begins
Popliteus innervation
Tibial nerve
Soleus origin and insertion
origin: Extensive cone-shaped origin from superior tibia, fibula, and interosseous membrane; insertion: As for Gastrocnemius
Plantaris action
Assists in knee flexion and plantar flexion of foot
Plantaris innervation
Tibial nerve
Gastrocnemius origin and insertion
origin: By two heads from medial and lateral condyles of femur; insertion: Calcaneus via calcaneal tendon
Soleus action
Plantar flexes ankle; important locomotor and postural muscle during walking, running, and dancing
Soleus innervation
Tibial nerve
Peroneus Brevis origin and insertion
origin: Distal fibula shaft; insertion: By tendon running behind lateral malleolus to insert on proximal end of fifth metatarsal
Gastrocnemius action
Plantar flexes foot when knee is extended; since it also crosses knee joint, it can flex knee when foot is dorsiflexed
Gastrocnemius innervation
Tibial nerve
Peroneus Longus origin and insertion
origin: Head and upper portion of fibula; insertion: By long tendon that curves under foot to first metatarsal and medial cuneiform
Peroneus Brevis action
Plantar flexes and everts foot
Peroneus Brevis innervation
Superficial peroneal nerve

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