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Questions and Answers
Which muscle is responsible for dorsiflexion of the foot at the ankle joint?
Which muscle is responsible for dorsiflexion of the foot at the ankle joint?
- Extensor digitorum longus
- Tibialis anterior (correct)
- Extensor hallucis longus
- Peroneus tertius
Which nerve supplies the muscles in the anterior compartment of the leg?
Which nerve supplies the muscles in the anterior compartment of the leg?
- Superficial peroneal nerve
- Tibial nerve
- Common peroneal nerve
- Deep peroneal nerve (correct)
Which artery is found in the lateral compartment of the leg?
Which artery is found in the lateral compartment of the leg?
- Fibular artery
- Peroneal artery (correct)
- Posterior tibial artery
- Anterior tibial artery
Where does the tibialis anterior muscle originate from?
Where does the tibialis anterior muscle originate from?
What is the action of the extensor digitorum longus muscle?
What is the action of the extensor digitorum longus muscle?
Which nerve supplies the peroneus tertius muscle?
Which nerve supplies the peroneus tertius muscle?
Where does the extensor digitorum longus muscle originate from?
Where does the extensor digitorum longus muscle originate from?
What is the action of the tibialis anterior muscle?
What is the action of the tibialis anterior muscle?
Which artery is found in the posterior compartment of the leg?
Which artery is found in the posterior compartment of the leg?
What is the insertion point for the tendon of tibialis anterior muscle?
What is the insertion point for the tendon of tibialis anterior muscle?
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Study Notes
Ankle Joint and Leg Muscles
- Dorsiflexion of the foot at the ankle joint is performed by the tibialis anterior muscle.
Nerve Supply
- The muscles in the anterior compartment of the leg are supplied by the deep peroneal nerve.
- The peroneus tertius muscle is supplied by the deep peroneal nerve.
Blood Supply
- The lateral compartment of the leg contains the fibular artery.
- The posterior compartment of the leg contains the posterior tibial artery.
Muscle Origin and Insertion
- The tibialis anterior muscle originates from the lateral condyle of the tibia and the medial cuneiform bone.
- The extensor digitorum longus muscle originates from the anterior surface of the fibula and the interosseous membrane.
- The tendon of the tibialis anterior muscle inserts into the medial cuneiform bone and the base of the first metatarsal bone.
Muscle Actions
- The extensor digitorum longus muscle extends the lateral four toes.
- The tibialis anterior muscle dorsiflexes and invertes the foot at the ankle joint.
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