Podcast
Questions and Answers
What is the origin of the peroneus brevis muscle?
What is the origin of the peroneus brevis muscle?
- Lower 2/3 of the lateral surface of the fibula
- Upper 1/3 of the lateral surface of the fibula
- Lower 1/3 of the lateral surface of the fibula (correct)
- Upper 2/3 of the lateral surface of the fibula
What is the insertion of the peroneus brevis muscle?
What is the insertion of the peroneus brevis muscle?
- Base of the 5th metatarsal (correct)
- Base of the 3rd metatarsal
- Base of the 2nd metatarsal
- Base of the 1st metatarsal
What is the nerve supply of the peroneus brevis muscle?
What is the nerve supply of the peroneus brevis muscle?
- Sural nerve
- Deep peroneal nerve
- Superficial peroneal nerve (correct)
- Tibial nerve
What is the action of the peroneus brevis muscle at the subtalar joint?
What is the action of the peroneus brevis muscle at the subtalar joint?
What is the action of the peroneus brevis muscle at the ankle joint?
What is the action of the peroneus brevis muscle at the ankle joint?
Which muscle does the peroneus brevis muscle work with to plantarflex the foot?
Which muscle does the peroneus brevis muscle work with to plantarflex the foot?
What is the function of the peroneus brevis muscle?
What is the function of the peroneus brevis muscle?
Where is the peroneus brevis muscle located?
Where is the peroneus brevis muscle located?
What is the relationship between the peroneus brevis and peroneus longus muscles?
What is the relationship between the peroneus brevis and peroneus longus muscles?
What is the primary action of the peroneus brevis muscle?
What is the primary action of the peroneus brevis muscle?
Study Notes
Anterior Compartment of Leg
- Muscles in the anterior compartment are: Tibialis anterior, Extensor hallucis longus, Extensor digitorum longus, and Fibularis tertius (Peroneus tertius)
- Tibialis anterior:
- Origin: Upper % of lateral surface of tibia
- Insertion: Medial Cuniform bone and base of 1st metatarsal bone
- Nerve supply: Deep peroneal nerve
- Actions: Dorsiflexion at ankle joint, inversion of foot at subtalar joint, and rotation of the foot so sole will face medially
- Extensor Hallucis longus:
- Origin: Middle 2/4 of anterior surface of fibula
- Insertion: Base of terminal phalanx of big toe
- Nerve supply: Deep peroneal nerve
- Actions: Extension of all joints of big toe, and dorsiflexion of ankle
- Extensor Digitorum longus:
- Origin: Upper 3/4 of anterior surface of fibula
- Insertion: Divide into 4 tendons to base of distal phalanx of lateral 4 toes
- Nerve supply: Deep peroneal nerve
- Actions: Extension of all joints of lateral 4 toes, and dorsiflexion of ankle
Lateral Compartment of Leg
- Muscles in the lateral compartment are: Peroneus longus and Peroneus brevis
- Peroneus longus:
- Origin: Upper 2/3 of lateral surface of fibula
- Insertion: Into medial cuniform bone and base of 1st metatarsal bone
- Nerve supply: Superficial peroneal nerve
- Actions: Eversion of foot at subtalar joint, plantar flexion of foot at ankle, and maintains transverse and lateral longitudinal arches of foot
- Crosses posterior to the ankle joint (plantar flexion) and into the subtalar joint (eversion)
- Peroneus brevis:
- Origin: Lower 1/3 of lateral surface of fibula
- Insertion: Base of 5th metatarsal
- Nerve supply: Superficial peroneal nerve
- Actions: Eversion of foot at subtalar joint, and plantar flexion of foot at ankle with peroneus longus
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Description
Test your knowledge of the muscles in the anterior compartment of the leg, including their origins, insertions, nerve supply, and actions. This quiz covers the tibialis anterior, extensor hallucis longus, and more.
