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Questions and Answers
What is the primary function of the muscles in the lateral compartment of the leg?
What is the primary function of the muscles in the lateral compartment of the leg?
- Extension of the foot (correct)
- Abduction of the foot
- Adduction of the foot
- Flexion of the foot
What is the name of the nerve that is most commonly injured in the lower limb?
What is the name of the nerve that is most commonly injured in the lower limb?
- Saphenous nerve
- Common peroneal nerve (correct)
- Tibial nerve
- Femoral nerve
What is the name of the structure that keeps the tendons of the peroneus longus and peroneus brevis in position?
What is the name of the structure that keeps the tendons of the peroneus longus and peroneus brevis in position?
- Flexor retinaculum
- Extensor retinaculum
- Tibial retinaculum
- Peroneal retinaculum (correct)
What is the attachment of the superior peroneal retinaculum posteriorly?
What is the attachment of the superior peroneal retinaculum posteriorly?
Which of the following structures does NOT contribute to the boundaries of the lateral compartment of the leg?
Which of the following structures does NOT contribute to the boundaries of the lateral compartment of the leg?
What is the primary source of blood supply to the lateral compartment of the leg?
What is the primary source of blood supply to the lateral compartment of the leg?
Where does the superficial peroneal nerve lie in relation to the peroneus longus and peroneus brevis tendons?
Where does the superficial peroneal nerve lie in relation to the peroneus longus and peroneus brevis tendons?
What is the most likely cause of sensory loss on the dorsum of the foot, except in the first web space?
What is the most likely cause of sensory loss on the dorsum of the foot, except in the first web space?
Where is the insertion of the peroneus brevis muscle located?
Where is the insertion of the peroneus brevis muscle located?
What is the primary action of the peroneus brevis muscle?
What is the primary action of the peroneus brevis muscle?
Which nerve supplies the peroneus brevis muscle?
Which nerve supplies the peroneus brevis muscle?
What is the origin of the superficial peroneal nerve?
What is the origin of the superficial peroneal nerve?
Which artery primarily supplies the lateral compartment of the leg?
Which artery primarily supplies the lateral compartment of the leg?
What type of foot deformity occurs due to overactivity of the invertor muscles following injury to the superficial peroneal nerve?
What type of foot deformity occurs due to overactivity of the invertor muscles following injury to the superficial peroneal nerve?
Where does the superficial peroneal nerve divide into its terminal branches?
Where does the superficial peroneal nerve divide into its terminal branches?
Which area is NOT supplied by the cutaneous branches of the superficial peroneal nerve?
Which area is NOT supplied by the cutaneous branches of the superficial peroneal nerve?
Which structure lies inferior to the inferior peroneal retinaculum?
Which structure lies inferior to the inferior peroneal retinaculum?
What is the relationship between the tendons of peroneus longus and peroneus brevis in terms of their synovial sheaths?
What is the relationship between the tendons of peroneus longus and peroneus brevis in terms of their synovial sheaths?
Where does the peroneus longus muscle originate?
Where does the peroneus longus muscle originate?
What anatomical feature is formed by the inferior peroneal retinaculum?
What anatomical feature is formed by the inferior peroneal retinaculum?
How is the peroneus brevis characterized in relation to the peroneus longus?
How is the peroneus brevis characterized in relation to the peroneus longus?
What potential issue can arise for athletes with tight shoes regarding the tendons?
What potential issue can arise for athletes with tight shoes regarding the tendons?
What nerve supplies the peroneus longus muscle?
What nerve supplies the peroneus longus muscle?
Flashcards
Lateral compartment of the leg
Lateral compartment of the leg
The lateral compartment of the leg, containing the peroneus longus and brevis muscles, which are primary extensors of the foot.
Superior peroneal retinaculum
Superior peroneal retinaculum
A band of deep fascia on the lateral side of the ankle that helps keep the tendons of the peroneus longus and brevis in place.
Peroneus brevis muscle
Peroneus brevis muscle
The muscle that originates on the fibula and inserts on the base of the fifth metatarsal, helping to evert the foot.
Peroneus longus muscle
Peroneus longus muscle
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Anterior intermuscular septum
Anterior intermuscular septum
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Posterior intermuscular septum
Posterior intermuscular septum
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Superficial peroneal nerve
Superficial peroneal nerve
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Common peroneal nerve injury
Common peroneal nerve injury
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Where is the peroneus brevis?
Where is the peroneus brevis?
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What nerve supplies the peroneus brevis?
What nerve supplies the peroneus brevis?
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What are the actions of the peroneus brevis?
What are the actions of the peroneus brevis?
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Where does the superficial peroneal nerve originate?
Where does the superficial peroneal nerve originate?
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Describe the superficial peroneal nerve's course.
Describe the superficial peroneal nerve's course.
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Which muscles does the superficial peroneal nerve supply?
Which muscles does the superficial peroneal nerve supply?
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What is the sensory role of the superficial peroneal nerve?
What is the sensory role of the superficial peroneal nerve?
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What is talipes valgus?
What is talipes valgus?
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Inferior Peroneal Retinaculum
Inferior Peroneal Retinaculum
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Tendon Passage through Inferior Peroneal Retinaculum
Tendon Passage through Inferior Peroneal Retinaculum
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Peroneal Tendinitis
Peroneal Tendinitis
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Peroneus Longus
Peroneus Longus
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Sesamoid Bone in Peroneus Longus Tendon
Sesamoid Bone in Peroneus Longus Tendon
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Peroneus Brevis
Peroneus Brevis
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Actions of Peroneus Longus
Actions of Peroneus Longus
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Actions of Peroneus Brevis
Actions of Peroneus Brevis
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Study Notes
Lateral and Medial Sides of the Leg
- The lateral compartment of the leg, also known as the peroneal compartment, contains muscles that are primary movers of the foot, namely peroneus longus and peroneus brevis.
- No artery runs within this compartment, instead, perforating branches of the anterior tibial and peroneal arteries supply blood through intermuscular septa.
- The common peroneal nerve wraps around the upper lateral part of the fibular neck, which is a frequent site of nerve injury in the lower leg.
- The boundaries of the lateral compartment include the anterior and posterior intermuscular septum, the lateral surface of the fibula, and the deep fascia of the leg.
Superior and Inferior Peroneal Retinacula
- Two thick bands of deep fascia, called peroneal retinacula, help hold the tendons of peroneus longus and peroneus brevis in place at the ankle.
- The superior retinaculum sits behind the lateral malleolus, attaching to it and the calcaneum.
- The inferior retinaculum is situated anteroinferior to the lateral malleolus, attaching to the superior surface of the calcaneum and peroneal trochlea.
- The tendons of peroneus longus and peroneus brevis lie deep to these retinacula, enclosed in a common synovial sheath.
Peroneal Muscles
- Peroneus Longus: A bipennate muscle in the upper portion and unipennate in the lower, arising from the upper two-thirds of the fibula and the intermuscular septa of leg.
- It inserts into the medial cuneiform and the base of the first metatarsal, after passing through a groove behind the lateral malleolus and over the inferior peroneal retinaculum.
- Peroneus Brevis: A shorter muscle situated deeper than the peroneus longus arising from the lower two-thirds of the fibula.
- The tendon passes behind the lateral malleolus underneath the superior peroneal retinaculum.
- It inserts onto the lateral side of the base of the fifth metatarsal.
Nerve Supply
- Peroneal muscles are innervated by the superficial peroneal nerve, a branch of the common peroneal nerve.
Arterial Supply
- Lateral compartment is supplied by the peroneal/fibular artery and anterior tibial artery.
Clinical Correlations
- Overactivity of the muscles that control the foot's inversion or eversion may cause deformities.
- Injuries to the superficial peroneal nerve can cause paralysis of the peroneal muscles, resulting in problems with foot eversion and sensation loss.
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Description
Explore the anatomy of the lateral compartment of the leg, focusing on the muscles, blood supply, and nerve innervation. This quiz also covers the role of the peroneal retinacula in ankle stability. Test your understanding of the structural components and their functions.
