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ORIGINS, INSERTIONS AND ACTIONS BY TAELAR SHELTON, MS, ATC, AT/L Ankle Muscles.

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Presentation on theme: "ORIGINS, INSERTIONS AND ACTIONS BY TAELAR SHELTON, MS, ATC, AT/L Ankle Muscles."— Presentation transcript:

1 ORIGINS, INSERTIONS AND ACTIONS BY TAELAR SHELTON, MS, ATC, AT/L Ankle Muscles

2 Origins of muscles Origins are the flixed attachment point of muscles in the bone (this bone doesn’t move when the action of the muscle is performed)

3 Insertions of muslces Insertions is the attachment point of the tendon into the bone that moves when the action of the muscle is performed

4 Actions of muslces Actions- what the muscles does

5 Tibialis Anterior O- lateral condyle and upper 2/3rds of tibia I- by tendon into interior surface of medial cuneiform and 1 st metatarsal bone A- prime mover of dorsiflexion inverts foot; assists in supporting medial longitudinal arch of foot

6 Extensor Digitorum O- lateral condyle of the tibia; proximal ¾ of the fibula; interosseous membrane I- second and third phalanges of toes 2-5 via extensor expansion A- dorsiflexes foot; prime mover of toe extension

7 Peroneus Brevis O- distal fibula shaft I- by tendon running behind lateral malleolus to insert on the proximal end of the 5 th metatarsal A- plantar flexes and everts the foot

8 Extensor Hallucis Longus O- Anteriomedial fibula shaft and interosseous membrane I- tendon inserts on the distal phalnx of the great toe A- extension of the great toe; dorsiflexion

9 Peroneus Tertius O- distal anterior surface of the fibula; interosseous membrane I- Tendon passes anterior to lateral malleolus and inserts on the dosum of the 5 th metatarsal A- dorsiflexes and everts the foot

10 Peroneus Longus O- head and upper portion of fibula I- by long tendon that curves under the foot to 1 st metatarsal and medial cuneiform A- plantarflexes and everts foot; helps keep foot flat on the ground

11 Tibialis Posterior O- extensive origin from superior tibia and fibula and the interosseous membrane I- tendon passes behind medial malleolus and under the arch of the foot; inserts into several tarsals and metatarsals 2-4 A- prime mover of foot inversion; plantar flexes ankle, stabilizes medial longitudinal arch

12 Flexor Digitorum O- Posterior tibia I- tendon runs behind medial malleolus and splits to insert into distal phalanages of toes 2-5 A- plantar flexes and inverts foot; flexes toes; helps foot grip ground

13 Flexor Hallucis Longus O- middle part of the shaft of fibula; interosseous membrane I- tendon runs under foot to distal phalanx of great toe A- plantar flexes and inverts foot; flexes great toe at all joints; push off muscle during walking

14 Popliteus O- lateral condyle of femur I- proximal tibia A- flexes and rotates leg medially to unlock knee from full extension when flexion begins

15 Plantaris O- posterior femur above the lateral condyle I- via a long, thin tendon into the calcaneus or calcaneal tendon (achilles) A- assists in knee flexion and plantar flexion of foot

16 Soleus O- extensive cone shaped origin from the superior tibia, fibula and interossous membrane I- calcaneus via calcaneal tendon A- plantar flexes ankle; important locomotor and postural muscle during walking, running and dancing

17 Gastrocnemius O- by two heads from the medial and lateral condyles of the femur I- calcaneus via calcaneal tendon A- Plantar flexes foot when knee is extended; can flex the knee when the foot is dorsiflexed


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