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Muscles of the Crus

Anterior, Lateral, and posterior Crus muscles, and details therein

QuestionAnswer
What is the origin of the Tibialis Anterior Muscle? Lateral condyle, proximal half of the shaft of the tibia, and adjacent interosseous membrane.
What is the origin of the Extensor digitorum longus muscle? Lateral condyle of the tibia,proximal 3/4 ths of the medial surface of the fibula, and adjacent interosseous membrane.
What is the origin of the extensor hallucis longus? Medial surface of the middle portion of the fibula and the adjacent interosseous membrane.
What is the origin of the Fibularis (Peroneus) tertius? Medial surface of the distal third of the fibula and adjacent interosseous membrane. (fibers blend with the extensor digitorum longus)
What is the insertion of the Tibialis anterior? Medial and inferior surfaces of the medial cuneiform and the base of the first metatarsal bone.
What is the insertion of the Extensor digitorum longus muscle? Middle phalanx and distal phalanx of the four lesser toes via the extensor expansion.
What is the insertion of the Extensor hallucis longus? Dorsal side of the base of the distal phalanx of the large toe with tendinous expansions to the base of the proximal phalanx on either side.
What is the insertion of the Fibularis (Peroneus) tertius? Medial side of the dorsal surface of the base of 5th metatarsal and down onto the shaft of this bone.
What is the Function of the Tibialis anterior? Dorsal flexion of the ankle joint (tibiotalar); inversion of the foot.
What is the function of the Extensor digitorum longus muscle? Dorsal flexion of the ankle joint; extension of the four small toes.
What is the function of the Extensor hallucis longus? Dorsal flexion of ankle; extension fo the big toe.
What is the function of the Fibularis (Peroneus) tertius? Dorsal flexion of the ankle joint; eversion of the foot.
What is the origin of the Fibularis (Peroneus) longus? Lateral suface of head and proximal 2/3rds of the fibula
What is the Origin of the Fibularis (Peroneus) brevis? Lateral surface of the distal 2/3rds of the shaft of the fibula; anterior and posterior crural intermuscular septa.
What is the insertion of the Fibularis (Peroneus) Longus? Lateral side of the base of the first metatarsal bone, lateral side of the base of the medial cuneiform. and the inferior base of the second metatarsal bone.
What is the insertion of the Fibularis (Peroneus) brevis? Tubercle on the lateral base of the 5th metatarsal bone.
What is the function of the Fibularis (Peroneus) longus? Plantar flexion of the ankle joint; eversion of the foot; helps maintain the longitudinal and transverse arches of the foot.
What is the function of the fibularis (Peroneus) brevis? Weak plantar flexor of the ankle joint; eversion of the foot.
What is the Origin of the Tibialis posterior? Posterior surface of the interosseous membrane and the adjacent surfaces of the tibia and the fibula.
What is the Origin of the Flexor digitorum longus? Posterior surface of the shaft of the tibia from below the soleal line to the level of the proximal end of the medial malleolus.
What is the Origin of the Flexor hallucis longus? Posterior surface of the distal two-thirds of the fibula, adjacent interosseous membrane, and the fascia fof the tibialis posterior.
What is the Origin of the Popliteus? Popliteal groove on the lateral surface of the lateral condyle of the femur, lateral side of the lateral meniscus, and the arcuate popliteal ligament of the joint capsule of the knee.
What is the Origin of the Plantaris? Distal aspect of the lateral supracondylar line and the oblique popliteal ligament.
What is the origin of the Soleus? Posterior surface of the fibular head and proximal end of the fibular shaft, soleal line and medial border of the middle of the tibia.
What is the Origin of the Gastrocnemius? Proximal surface of the lateral condyle of the femur posterior to the adductor tubercle and a ridge on the posterior surface of the femur just proximal to the medial condyle.
What is the Insertion of the Tibialis posterior? Tuberosity of the navicular bone, plantar surface of the medial and intermediate cuneiform, tip of the sustentaculum tali, and the base of the 2nd, 3rd, and 4th medtatarsal bones.
What is the Insertion of the Flexor digitorum longus? Plantar surface of the base of the distal phalanges of the 4 small toes.
What is the Insertion of the Flexor Hallucis Longus? Plantar surface of the base of terminal phalanx of the great toe.
What is the Insertion of the Popliteus? Triangular posterior surface of the tibia above the soleal line.
What is the Insertion of the Plantaris? Posterior surface of the calcaneus.
What is the Insertion of the Soleus? Posterior surface of the calcaneus via the shared tendo calcaneus.
What is the Insertion of the Gastrocnemius? Posterior surface of the calcaneus via the shared tendo calcaneus.
What is the Function of the Tibialis posterior? Primary inverter of the foot; assists in plantar flexion of the ankle joint.
What is the Function of the Flexor digitorum longus? Flextion of the little toes; weak plantar flexion of the ankle joint; assist in mantaining the longitudinal arches of the foot.
What is the Function of the Flexor hallucis longus? Flexion of first toe; weak plantar flexion of the ankel joint; assist in maintaining the longitudinal arches of the foot.
What is the Function of the Popliteus? Medially rotates tibia on the femur; unlocks the hyperextended knee, retracts the lateral miniscus to prevent it from getting crushed during knee flexion.
What is the Function of the Plantaris? Assists with plantar flexion of the ankle joint and flexion of the knee.
What is the Function of the Soleus? Plantar flexion of the ankle joint; play an important postural role in stabilizing the leg over the ankle in standing.
What is the Function of the Gastrocnemius? Plantar flextion of the ankle joint; flexion of the knee.
Created by: ChanellK
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