Anatomy Muscles 150-175
Terms
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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